# CDC 2r051 Vol. 3 Statistical Methods

79 Questions | Total Attempts: 92  Settings  CDC 2R051 Editon 5 Volume 3. Statistical Methods URE Questions

• 1.
(401) A natural number is stated as a positive number that
• A.

Has any actual value from zero to infinity.

• B.

Has its own unique properties.

• C.

• D.

Can be summed.

• 2.
(401) What is the value of 5 ÷ 2 × 6?
• A.

0.3.

• B.

8.4.

• C.

15.0.

• D.

30.0.

• 3.
(401) When using natural numbers, a number placed directly behind brackets, with no sign of operation between, indicates that
• A.

You must multiply and divide before adding and subtracting.

• B.

You can perform the calculation with or without the brackets.

• C.

The brackets should be removed before performing the calculation.

• D.

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

• 4.
(401) Which phrase is true regarding signed numbers?
• A.

Only whole numbers are used.

• B.

Negative numbers are not used.

• C.

Dividing by zero is permitted.

• D.

Both positive and negative numbers have values.

• 5.
(401) Compute the difference of the signed numbers –17 – (–10).
• A.

+3.0.

• B.

–3.0.

• C.

–7.0.

• D.

–27.0.

• 6.
(401) How do you write: “The square root of 25 is 5.” as a mathematical expression?
• A.

• B.
• C.
• D.
• 7.
(402) What is 22 percent of 12?
• A.

1.83.

• B.

2.64.

• C.

18.30.

• D.

26.40.

• 8.
(403) Which statistical technique is an example of descriptive statistics?
• A.

Probability.

• B.

Extrapolation.

• C.

Trend analysis.

• D.

Measurement scales.

• 9.
(404) In the equation Y=X+2, what does the symbol “Y” represent?
• A.

Exponent.

• B.

Inequality.

• C.

Subscript.

• D.

Variable.

• 10.
(404) What is the value of 4^3?
• A.

64.

• B.

24.

• C.

12.

• D.

7.

• 11.
(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?
• A.

Biased sample

• B.

Random sample

• C.

Sampling theory

• D.

Sampling application

• 12.
(405) If you construct a QLP retrieval to select every 8th record, you are using which sampling technique?
• A.

Selective

• B.

Stratified

• C.

Systematic

• D.

Purposeful

• 13.
(406) Which measurement scale consists of equal intervals between scale values and an arbitrary zero point?
• A.

Ratio

• B.

Nominal

• C.

Ordinal

• D.

Interval

• 14.
(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?
• A.

375.0 pounds

• B.

415.5 pounds

• C.

437.5 pounds

• D.

500.0 pounds

• 15.
(406) Given measurements of 5.0 hours, 10.0 hours, 15.0 hours, and 20.0 hours, what type of data and measurement scale would you use to classify these data items?
• A.

Discrete; ratio

• B.

Discrete; interval

• C.

Continuous; ratio

• D.

Continuous; interbal

• 16.
(407) The second step in making a frequency distribution is to
• A.

Determine the range of the data

• B.

Determine the class interval size

• C.

Range the data from largest to smallest

• D.

Range the data from smallest to largest

• 17.
(407) With a noncumulative frequency distribution range of 3.6, which class interval will give you 18 classes?
• A.

0.1

• B.

0.2

• C.

0.3

• D.

0.4

• 18.
(407) One way of comparing class frequencies to the total frequency is by
• A.

Indirect comparison

• B.

Direct comparison

• C.

Visual inspection

• D.

Percentage

• 19.
(408) What does each rectangle in a histogram represent?
• A.

Value of the data

• B.

One class of data

• C.

Upper and lower limits

• D.

Number of frequencies

• 20.
(408) When constructing a frequency polygon, what are plotted against the corresponding midpoints?
• A.

Series of rectangles

• B.

Individual values of data

• C.

Lower limit and baseline

• D.

Frequencies of the various class intervals

• 21.
(409) What measure of central tendency is the most typical value in a distribution?
• A.

Mean

• B.

Mode

• C.

Median

• D.

Weighted mean

• 22.
(409) The mode is the only measure of central tendency that can be used with what measurement scale?
• A.

Ratio

• B.

Interval

• C.

Ordinal

• D.

Nominal

• 23.
(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
• A.

Normal

• B.

Skewed

• C.

Incomplete

• D.

Inconclusive

• 24.
(410) The median cannot be used with data from which measurement scale?
• A.

Nominal

• B.

Interval

• C.

Ordinal

• D.

Ratio

• 25.
(410) What must you do first to determine the median from ungrouped data?
• A.

Arrange the data in classes

• B.

Determine the numerical averages

• C.

Determine the total of the values

• D.

Arrange the data in ascending order

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