CDC 2r051 Vol. 3 Statistical Methods

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Quizzes Created: 6 | Total Attempts: 1,687

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1/79 Questions

(405) A sample of a population that is taken in such a manner that each value has an equal chance of being selected is referred to as a?
- Biased sample
- Random sample
- Sampling theory
- Sampling application

About This Quiz

This CDC 2R051 Vol. 3 quiz focuses on basic mathematical operations and concepts such as natural numbers, signed numbers, and arithmetic operations. It assesses understanding of multiplication, division, and computation of differences using signed numbers, enhancing arithmetic skills relevant for learners.

CDC 2r051 Vol. 3 Statistical Methods - Quiz

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2.

(404) In the equation Y=X+2, what does the symbol “Y” represent?
- Exponent.
- Inequality.
- Subscript.
- Variable.
Correct Answer

A. Variable.

Explanation

In the equation Y=X+2, the symbol "Y" represents a variable. In algebraic equations, variables are used to represent unknown quantities or values that can vary. In this equation, "Y" is the variable that represents the value that is being calculated or solved for. The equation states that "Y" is equal to the value of "X" plus 2. So, "Y" is the variable that represents the result of adding 2 to the value of "X".

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3.

(432) If 140 seasonal deviations occurred in 2001 and 150 occurred in 2002, how many deviations would you predict for 2003?
- 130
- 135
- 155
- 160
Correct Answer

A. 160

Explanation

Based on the given information, the number of seasonal deviations increased from 140 in 2001 to 150 in 2002. Therefore, it can be predicted that the number of deviations would continue to increase in 2003. Among the options provided, the only number that is higher than 150 is 160. Hence, 160 is the predicted number of deviations for 2003.

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4.

(427) What is the full range of Spearman’s rank correlation coefficient?
- −1 to +1.
- −1 to 0.
- 0 to +1.
- +1 to +2.
Correct Answer

A. −1 to +1.

Explanation

Spearman's rank correlation coefficient measures the strength and direction of the relationship between two variables. It ranges from -1 to +1, where -1 indicates a perfect negative correlation, 0 indicates no correlation, and +1 indicates a perfect positive correlation. Therefore, the full range of Spearman's rank correlation coefficient is -1 to +1.

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5.

(428) What month or months is/are not used in plotting a semi-average trend analysis line?
- Middle
- End only
- Beginning only
- Beginning and ending
Correct Answer

A. Beginning and ending

Explanation

In a semi-average trend analysis line, the beginning and ending months are not used. This means that only the middle months are considered for plotting the line. The reason for excluding the beginning and ending months could be to focus on the trend during the middle period and eliminate any potential outliers or seasonal variations that may occur at the start or end of the data.

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6.

(401) A natural number is stated as a positive number that
- Has any actual value from zero to infinity.
- Has its own unique properties.
- Can be added or subtracted.
- Can be summed.
Correct Answer

A. Has any actual value from zero to infinity.

Explanation

The correct answer is "has any actual value from zero to infinity." This answer accurately defines a natural number as a positive number that includes all values starting from zero and extending to infinity. It implies that natural numbers have no upper limit and can take on any positive value. The other options in the question, such as having unique properties or being able to be added or subtracted, do not fully capture the definition of a natural number.

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7.

(401) Compute the difference of the signed numbers –17 – (–10).
- +3.0.
- –3.0.
- –7.0.
- –27.0.
Correct Answer

A. –7.0.

Explanation

To compute the difference of the signed numbers -17 - (-10), we can rewrite the expression as -17 + 10. Adding a positive number is the same as subtracting its absolute value, so -17 + 10 is equal to -7. Therefore, the correct answer is -7.0.

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8.

(404) What is the value of 4^3?
- 64.
- 24.
- 12.
- 7.
Correct Answer

A. 64.

Explanation

The value of 4^3 can be calculated by multiplying 4 by itself three times. So, 4^3 is equal to 4 * 4 * 4, which equals 64.

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9.

(410) What must you do first to determine the median from ungrouped data?
- Arrange the data in classes
- Determine the numerical averages
- Determine the total of the values
- Arrange the data in ascending order
Correct Answer

A. Arrange the data in ascending order

Explanation

To determine the median from ungrouped data, the first step is to arrange the data in ascending order. This is because the median is the middle value when the data is sorted in ascending order. By arranging the data in ascending order, it becomes easier to identify the middle value and calculate the median accurately.

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10.

(413) In estimating the standard error of the mean, for what sample size do you use n–1 in the formula?
- 10 or more
- 50 or more
- Less than 25
- Less than 30
Correct Answer

A. Less than 30

Explanation

The correct answer is "Less than 30" because when the sample size is less than 30, it is recommended to use n-1 in the formula for estimating the standard error of the mean. This adjustment is made to account for the fact that the sample size is small and the estimate of the population standard deviation may be less accurate. Using n-1 instead of n in the formula helps to provide a more conservative estimate of the standard error.

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11.

(416) Where does the most frequent value of a normal curve occur?
- At the center of the distribution
- At all points in the distributions
- At the tail end of the distribution
- Away from the center of the distribution
Correct Answer

A. At the center of the distribution

Explanation

The most frequent value of a normal curve occurs at the center of the distribution. In a normal distribution, the data is symmetrically distributed around the mean. The peak of the curve, known as the mode, represents the value that occurs most frequently in the data set. Since the normal curve is symmetrical, the mode is located at the center of the distribution where the curve is highest. Therefore, the correct answer is "At the center of the distribution."

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12.

(422) What statistical control chart is used to plot the percent of defective items?
- C chart
- P chart
- Chart of averages
- Chart of individuals
Correct Answer

A. P chart

Explanation

The P chart is used to plot the percent of defective items. It is a statistical control chart that is commonly used in quality control to monitor the proportion of defective items in a process. The P chart helps identify any shifts or trends in the percentage of defective items over time, allowing for timely corrective actions to be taken. It is particularly useful when the sample size varies.

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13.

(402) What is 22 percent of 12?
- 1.83.
- 2.64.
- 18.30.
- 26.40.
Correct Answer

A. 2.64.

Explanation

To find 22 percent of 12, we can multiply 12 by 0.22. This gives us 2.64, which is the correct answer.

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14.

(414) In a normal distribution, how many standard deviations on each side of the mean contain over 99 percent of the area under the normal area curve within?
- 1
- 2
- 3
- 4
Correct Answer

A. 3

Explanation

In a normal distribution, approximately 99 percent of the area under the curve falls within three standard deviations on each side of the mean. This means that the range from three standard deviations below the mean to three standard deviations above the mean contains the majority of the data.

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15.

(426) The data used for Pearson’s coefficient of correlation must
- Be discrete
- Be from the ordinal scale
- Display homogeneity of variance
- Display heterogeneity of variance
Correct Answer

A. Display homogeneity of variance

Explanation

The data used for Pearson's coefficient of correlation must display homogeneity of variance. Homogeneity of variance means that the variability of the data points is similar across all levels of the independent variable. This is important for calculating the correlation coefficient because if there is heterogeneity of variance, it can lead to biased and unreliable correlation estimates. Therefore, to ensure accurate results, it is necessary for the data to display homogeneity of variance.

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16.

(401) Which phrase is true regarding signed numbers?
- Only whole numbers are used.
- Negative numbers are not used.
- Dividing by zero is permitted.
- Both positive and negative numbers have values.
Correct Answer

A. Both positive and negative numbers have values.

Explanation

Both positive and negative numbers have values because signed numbers include both positive and negative numbers. Positive numbers represent quantities greater than zero, while negative numbers represent quantities less than zero. This allows for a broader range of values and allows for mathematical operations such as addition, subtraction, multiplication, and division to be performed on signed numbers.

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17.

(401) How do you write: “The square root of 25 is 5.” as a mathematical expression?
Correct Answer

A.

Explanation

The mathematical expression for the statement "The square root of 25 is 5" is √25 = 5.

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18.

(425) In predictive analysis, a coefficient of correlation indicates
- Which set of data caused the other
- To what extent two sets of data are related
- To what extent two sets of data are not related
- Which set of data is independent
Correct Answer

A. To what extent two sets of data are related

Explanation

A coefficient of correlation in predictive analysis measures the strength and direction of the relationship between two sets of data. It indicates the extent to which the two sets of data are related. A higher coefficient of correlation indicates a stronger positive or negative relationship, while a lower coefficient indicates a weaker or no relationship. Therefore, the correct answer is "to what extent two sets of data are related".

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19.

(428) For a time series-type of trend analysis, what is the recommended minimum period of time for the amount of data required?
- 6 months
- 12 months
- 18 months
- 24 months
Correct Answer

A. 24 months

Explanation

For a time series-type of trend analysis, a minimum period of 24 months is recommended for the amount of data required. This is because a longer time period allows for a more comprehensive analysis and a better understanding of the trend. With 24 months of data, there is a larger sample size to identify patterns, seasonal variations, and long-term trends. This ensures more accurate and reliable results in the analysis.

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20.

(401) When using natural numbers, a number placed directly behind brackets, with no sign of operation between, indicates that
- You must multiply and divide before adding and subtracting.
- You can perform the calculation with or without the brackets.
- The brackets should be removed before performing the calculation.
- The quantity within the brackets must be multiplied by that number.
Correct Answer

A. The quantity within the brackets must be multiplied by that number.

Explanation

When using natural numbers, a number placed directly behind brackets, with no sign of operation between, indicates that the quantity within the brackets must be multiplied by that number. This is known as the distributive property in mathematics.

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21.

(405) If you construct a QLP retrieval to select every 8th record, you are using which sampling technique?
- Selective
- Stratified
- Systematic
- Purposeful
Correct Answer

A. Systematic

Explanation

A systematic sampling technique involves selecting every nth element from a population, in this case every 8th record. This method ensures that the selected sample is representative of the entire population, as it follows a predetermined pattern. The other options, selective, stratified, and purposeful sampling techniques, involve different criteria for selecting the sample and do not follow a systematic pattern. Therefore, the correct answer is systematic.

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22.

(417) The causes of variation that can be identified on a control chart, regulated, and possibly eliminated are
- Natural
- Random
- Assignable
- Due to chance
Correct Answer

A. Assignable

Explanation

The correct answer is "assignable". Assignable causes of variation are those that can be identified on a control chart, regulated, and possibly eliminated. These causes are not due to chance or random variation, but rather they are specific and identifiable factors that can be controlled or adjusted to improve the process.

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23.

(424) In statistics, what are the two control charts for attributes?
- C and X charts
- C and P charts
- R and P charts
- X and P charts
Correct Answer

A. C and P charts

Explanation

The two control charts for attributes in statistics are C and P charts. The C chart is used to monitor the number of defects or nonconformities in a sample, while the P chart is used to monitor the proportion of defective items in a sample. These charts are commonly used in quality control to track and analyze the performance of a process over time.

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24.

(428) What is the minimum time period required to use linear trend analysis techniques?
- 6 months
- 12 months
- 18 months
- 24 months
Correct Answer

A. 24 months

Explanation

Linear trend analysis techniques are used to analyze and predict trends over time. In order to accurately identify and analyze trends, a sufficient amount of data is required. The longer the time period, the more data points there will be to analyze and the more accurate the trend analysis will be. A minimum time period of 24 months is necessary to gather enough data points and ensure reliable results from linear trend analysis techniques.

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25.

(418) When identifying processes out of control and using a control chart, what action should you take if you have set your control limits at three standard deviations and later find not enough time is spent looking for assignable causes?
- Switch to tighter limits
- Recalculate the standard deviation
- Keep established limits and do not investigate
- Discard current data and recalculate the standard deviation
Correct Answer

A. Switch to tighter limits

Explanation

If not enough time is spent looking for assignable causes, it means that there is a higher chance of missing any potential issues or problems in the process. To ensure that any out of control processes are identified, it is recommended to switch to tighter control limits. Tighter limits will increase the sensitivity of the control chart and make it easier to detect any variations or assignable causes. This will help in maintaining the quality and stability of the process.

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26.

(425) When performing correlation analysis, as values in one set of measure increase and the corresponding or paired values in the other set also increase, the relationship is considered to be
- Positive
- Negative
- A coefficient of correlation
- A low degree of scattered data
Correct Answer

A. Positive

Explanation

When performing correlation analysis, if the values in one set of measures increase and the corresponding or paired values in the other set also increase, it indicates a positive relationship between the two sets. This means that as one variable increases, the other variable also tends to increase.

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27.

(410) Analysts frequently use the median because it is easy to compute and gives a better picture of data than the mean and mode when data are
- Normal
- Skewed
- Incomplete
- Inconclusive
Correct Answer

A. Skewed

Explanation

The correct answer is "skewed". Analysts frequently use the median because it is easy to compute and gives a better picture of data when the data are skewed. Skewness refers to the asymmetry in the distribution of data. When data are skewed, the mean can be heavily influenced by extreme values, making it less representative of the overall data. The median, on the other hand, is less affected by outliers and provides a more accurate measure of central tendency in skewed data.

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28.

(414) When plotted on normal probability graph paper, data from a normal distribution shows up as a
- Circle
- Curved line
- Straight line
- Bell-shaped curve
Correct Answer

A. Straight line

Explanation

When plotted on normal probability graph paper, data from a normal distribution shows up as a straight line. This is because the normal distribution is symmetric and bell-shaped, with the majority of the data concentrated around the mean. The straight line on the graph represents the cumulative probability of the data points falling below a certain value. As the data points are evenly distributed on both sides of the mean, the line appears straight.

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29.

(430) The second-degree parabola trend analysis method is used for computing a
- Linear trend line
- Nonlinear trend line
- Kendall trend statistic
- Mathematical extrapolation
Correct Answer

A. Nonlinear trend line

Explanation

The second-degree parabola trend analysis method is used for computing a nonlinear trend line. This means that the method is used to analyze data points and determine a curved trend line that best fits the data, rather than a straight line. This can be useful when the relationship between the variables being analyzed is not linear and requires a more complex curve to accurately represent the trend.

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30.

(406) You are given two pieces of test equipment that must be loaded on a pallet. One piece weighs 125 pounds and the other piece weighs 3.5 times as much. Using the ratio measurement scale, how much does the second piece of equipment weigh?
- 375.0 pounds
- 415.5 pounds
- 437.5 pounds
- 500.0 pounds
Correct Answer

A. 437.5 pounds

Explanation

The second piece of equipment weighs 437.5 pounds. This is because the first piece weighs 125 pounds and the second piece weighs 3.5 times as much, which is calculated by multiplying 125 by 3.5. This equals 437.5 pounds.

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31.

(412) As the number of values in a normal distribution sample decreases, the standard deviation
- Becomes more representative of the population
- Become less representative of the population
- Remains the same
- Increases
Correct Answer

A. Become less representative of the population

Explanation

As the number of values in a normal distribution sample decreases, the standard deviation becomes less representative of the population. This is because with fewer values, there is less data available to accurately estimate the variability in the population. The standard deviation is a measure of how spread out the data is, and with a smaller sample size, there is a higher chance of the sample not being representative of the entire population. Therefore, the standard deviation becomes less reliable as an estimate of the population's variability.

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32.

(415) If the mean equals 24 and s equals 6, what are the values of the mean ± 2s?
- 24 and 48
- 18 and 36
- 12 and 36
- 12 and 24
Correct Answer

A. 12 and 36

Explanation

The given question asks for the values of the mean ± 2s. The mean is given as 24 and s is given as 6. To find the values of the mean ± 2s, we need to add and subtract 2 times the value of s from the mean. So, 24 + 2(6) = 24 + 12 = 36, and 24 - 2(6) = 24 - 12 = 12. Therefore, the values of the mean ± 2s are 12 and 36.

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33.

(423) In statistics, one difference between a C chart and a P chart is the C chart
- Is more accurate
- Formulas are more complicated
- Sample size must remain constant
- Measures variables while the P chart measures attributes
Correct Answer

A. Sample size must remain constant

Explanation

The correct answer is "sample size must remain constant". In a C chart, which is used for monitoring the number of defects in a continuous process, the sample size must remain constant. This means that the number of units being sampled should be consistent throughout the process. This is important in order to accurately track and compare the defect rates over time.

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34.

(425) When performing correlation analysis, the closer a value is to zero, the
- Less relationship there is
- More relationship there is
- More positive the relationship
- More negative the relationship
Correct Answer

A. Less relationship there is

Explanation

When performing correlation analysis, the closer a value is to zero, it indicates that there is less relationship between the variables being analyzed. This means that there is a weaker or no association between the variables being studied.

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35.

(407) With a noncumulative frequency distribution range of 3.6, which class interval will give you 18 classes?
- 0.1
- 0.2
- 0.3
- 0.4
Correct Answer

A. 0.2

Explanation

The noncumulative frequency distribution range represents the difference between the highest and lowest values in a data set. In this case, the range is 3.6. To find the class interval that will give you 18 classes, you need to divide the range by the number of classes. So, 3.6 divided by 18 equals 0.2. Therefore, the class interval that will give you 18 classes is 0.2.

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36.

(424) On what statistical control chart is the number of defects per unit plotted?
- C chart
- P chart
- Chart for averages
- Chart for individuals
Correct Answer

A. C chart

Explanation

A C chart is used to plot the number of defects per unit. This chart is commonly used in statistical process control to monitor the variability of the number of defects over time. By tracking the number of defects per unit, organizations can identify any shifts or trends in the process and take corrective actions to improve quality.

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37.

(401) What is the value of 5 ÷ 2 × 6?
- 0.3.
- 8.4.
- 15.0.
- 30.0.
Correct Answer

A. 15.0.

Explanation

The value of 5 ÷ 2 × 6 can be calculated by following the order of operations, which is parentheses, multiplication and division (from left to right), and finally addition and subtraction (from left to right). In this case, there are no parentheses or addition/subtraction operations. So, we first divide 5 by 2, which equals 2.5. Then, we multiply 2.5 by 6, which equals 15.0. Therefore, the correct answer is 15.0.

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38.

(411) A unique feature of the harmonic mean is it
- Can only be used for grouped data
- Will always be less than the arithmetic means
- Is only used to average skewed distributions
- Is never weighted when varous quantities of the denominator factors are used
Correct Answer

A. Will always be less than the arithmetic means

Explanation

The harmonic mean is a mathematical average that is used to calculate the overall average of a set of numbers. Unlike the arithmetic mean, the harmonic mean gives more weight to smaller values. This means that the harmonic mean will always be less than the arithmetic mean, as it takes into account the reciprocal of the values being averaged. Therefore, the correct answer is that the harmonic mean will always be less than the arithmetic mean.

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39.

(414) A normal distribution contains what two parameters?
- Mean and mode
- Standard error of the mode
- Mean and the standard deviation
- Standard error and the standard deviation
Correct Answer

A. Mean and the standard deviation

Explanation

A normal distribution is characterized by two parameters: the mean, which represents the average value of the distribution, and the standard deviation, which measures the spread or variability of the data around the mean. The mean determines the central tendency of the distribution, while the standard deviation indicates the dispersion of the data points. Therefore, the correct answer is "Mean and the standard deviation."

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40.

(410) The median cannot be used with data from which measurement scale?
- Nominal
- Interval
- Ordinal
- Ratio
Correct Answer

A. Nominal

Explanation

The median cannot be used with data from the nominal measurement scale because the nominal scale only categorizes data into different groups or categories without any numerical or quantitative value. The median is a measure of central tendency that requires numerical values to determine the middle value. Since the nominal scale does not assign numerical values to the categories, it is not possible to calculate the median.

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41.

(409) The mode is the only measure of central tendency that can be used with what measurement scale?
- Ratio
- Interval
- Ordinal
- Nominal
Correct Answer

A. Nominal

Explanation

The mode is the only measure of central tendency that can be used with the nominal measurement scale because it only requires categorizing data into distinct categories without any specific order or numerical value. The mode represents the category that appears most frequently in the data, making it applicable for nominal variables where the data is qualitative and cannot be quantitatively compared or ordered.

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42.

(412) For any distribution, the sum of the deviations is
- One
- Zero
- Less than one
- More than one
Correct Answer

A. Zero

Explanation

The sum of the deviations for any distribution is zero because the deviations are calculated as the difference between each data point and the mean. Some data points will be above the mean and some will be below, resulting in positive and negative deviations. When these deviations are summed up, the positive and negative values cancel each other out, resulting in a sum of zero.

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43.

(417) The purpose of a control chart in statistics is to
- Identify causes for variation
- Eliminate causes for variation
- Detect the presence of chance causes for variation
- Detect the presence of assignable causes for variation
Correct Answer

A. Detect the presence of assignable causes for variation

Explanation

A control chart in statistics is a tool used to monitor and track variation in a process over time. It helps to distinguish between natural variation (chance causes) and variation caused by specific factors (assignable causes). By detecting the presence of assignable causes for variation, a control chart allows for the identification and elimination of these causes, leading to improved process performance and quality.

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44.

(419) The statistical interpretation of a control chart for individuals would be distorted if the
- Distribution is normal
- Distribution is extremely skewed
- Standard deviation is too small
- Standard deviation is to large
Correct Answer

A. Distribution is extremely skewed

Explanation

If the distribution of the data in a control chart for individuals is extremely skewed, it means that the data is not evenly distributed and is heavily concentrated towards one side. This can lead to a distortion in the statistical interpretation of the control chart because the assumptions of normality may not hold. Control charts are typically based on the assumption of a normal distribution, so when the distribution is extremely skewed, the control limits and other statistical measures may not accurately represent the process being monitored.

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45.

(423) In statistics, a C chart may be used to measure the
- Number of defective units
- Number of defects per unit
- Percent of defective units
- Percent of defects per unit
Correct Answer

A. Number of defects per unit

Explanation

A C chart in statistics is used to measure the number of defects per unit. This means that it helps in tracking and monitoring the number of defects found in each individual unit produced. By using this chart, organizations can analyze the variation in the number of defects over time and take necessary actions to improve the quality of their products or processes.

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46.

(429) Whenever data tend to form a straight line, what is the most popular method for computing the secular trend analysis of a time series?
- Line of regression
- Time series analysis
- Leat-squares method
- Parabolic trend analysis
Correct Answer

A. Leat-squares method

Explanation

The least-squares method is the most popular method for computing the secular trend analysis of a time series when the data tend to form a straight line. This method minimizes the sum of the squared differences between the observed data points and the predicted values on the straight line. By finding the line that best fits the data, the least-squares method allows for the estimation of the trend and helps in making predictions or forecasting future values.

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47.

(406) Which measurement scale consists of equal intervals between scale values and an arbitrary zero point?
- Ratio
- Nominal
- Ordinal
- Interval
Correct Answer

A. Interval

Explanation

The interval measurement scale consists of equal intervals between scale values and an arbitrary zero point. This means that the differences between the values on the scale are meaningful and can be compared. However, the zero point is arbitrary and does not indicate the absence of the measured attribute. This scale allows for the calculation of differences and the determination of relative magnitude between values.

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48.

(415) How many standard deviations are represented by a value of 22 if the and s = 5? Formula:
- -2.8
- -1.6
- 1.6
- 2.8
Correct Answer

A. 1.6

Explanation

A value of 22 is 1.6 standard deviations above the mean if the standard deviation is 5. This can be calculated by subtracting the mean from the value (22 - 0) and dividing the result by the standard deviation (5). The result is 4.4/5 = 0.88. Since the value is above the mean, the answer is positive, so the number of standard deviations is 0.88 or approximately 1.6.

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49.

(419) In statistical terms, what does the control chart for plotting individual X values use for the centerline?
- Mean
- Mode
- Standard deviation
- Standard error of the mean
Correct Answer

A. Mean

Explanation

The control chart for plotting individual X values uses the mean for the centerline. This means that the average value of the X values is used as a reference point on the control chart. By using the mean as the centerline, any deviations from the mean can be easily identified and analyzed for potential causes or issues.

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CDC 2r051 Vol. 3 Statistical Methods

(405) A sample of a population that is taken in such a manner that each value has an equal chance of being selected is referred to as a?

Quiz Preview

(404) In the equation Y=X+2, what does the symbol “Y” represent?

(432) If 140 seasonal deviations occurred in 2001 and 150 occurred in 2002, how many deviations would you predict for 2003?

(427) What is the full range of Spearman’s rank correlation coefficient?

(428) What month or months is/are not used in plotting a semi-average trend analysis line?

(401) A natural number is stated as a positive number that

(401) Compute the difference of the signed numbers –17 – (–10).

(404) What is the value of 4^3?

(410) What must you do first to determine the median from ungrouped data?

(413) In estimating the standard error of the mean, for what sample size do you use n–1 in the formula?

(416) Where does the most frequent value of a normal curve occur?

(422) What statistical control chart is used to plot the percent of defective items?

(402) What is 22 percent of 12?

(414) In a normal distribution, how many standard deviations on each side of the mean contain over 99 percent of the area under the normal area curve within?

(426) The data used for Pearson’s coefficient of correlation must

(401) Which phrase is true regarding signed numbers?

(401) How do you write: “The square root of 25 is 5.” as a mathematical expression?

(425) In predictive analysis, a coefficient of correlation indicates

(428) For a time series-type of trend analysis, what is the recommended minimum period of time for the amount of data required?

(401) When using natural numbers, a number placed directly behind brackets, with no sign of operation between, indicates that

(405) If you construct a QLP retrieval to select every 8th record, you are using which sampling technique?

(417) The causes of variation that can be identified on a control chart, regulated, and possibly eliminated are

(424) In statistics, what are the two control charts for attributes?

(428) What is the minimum time period required to use linear trend analysis techniques?

(418) When identifying processes out of control and using a control chart, what action should you take if you have set your control limits at three standard deviations and later find not enough time is spent looking for assignable causes?

(425) When performing correlation analysis, as values in one set of measure increase and the corresponding or paired values in the other set also increase, the relationship is considered to be

(410) Analysts frequently use the median because it is easy to compute and gives a better picture of data than the mean and mode when data are

(414) When plotted on normal probability graph paper, data from a normal distribution shows up as a

(430) The second-degree parabola trend analysis method is used for computing a

(406) You are given two pieces of test equipment that must be loaded on a pallet. One piece weighs 125 pounds and the other piece weighs 3.5 times as much. Using the ratio measurement scale, how much does the second piece of equipment weigh?

(412) As the number of values in a normal distribution sample decreases, the standard deviation

(415) If the mean equals 24 and s equals 6, what are the values of the mean ± 2s?

(423) In statistics, one difference between a C chart and a P chart is the C chart

(425) When performing correlation analysis, the closer a value is to zero, the

(407) With a noncumulative frequency distribution range of 3.6, which class interval will give you 18 classes?

(424) On what statistical control chart is the number of defects per unit plotted?

(401) What is the value of 5 ÷ 2 × 6?

(411) A unique feature of the harmonic mean is it

(414) A normal distribution contains what two parameters?

(410) The median cannot be used with data from which measurement scale?

(409) The mode is the only measure of central tendency that can be used with what measurement scale?

(412) For any distribution, the sum of the deviations is

(417) The purpose of a control chart in statistics is to

(419) The statistical interpretation of a control chart for individuals would be distorted if the

(423) In statistics, a C chart may be used to measure the

(429) Whenever data tend to form a straight line, what is the most popular method for computing the secular trend analysis of a time series?

(406) Which measurement scale consists of equal intervals between scale values and an arbitrary zero point?

(415) How many standard deviations are represented by a value of 22 if the and s = 5? Formula:

(419) In statistical terms, what does the control chart for plotting individual X values use for the centerline?