Difference Between Groups Using Two-sample Inference

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| By Cripstwick

Cripstwick

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Quizzes Created: 636 | Total Attempts: 733,305

Questions: 10 | Attempts: 137 | Updated: Mar 20, 2023

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Difference Between Groups Using Two-sample Inference - Quiz

With a combination of significance tests and confidence intervals, evaluate your knowledge of how to use two-sample inference to define the difference between groups.

Questions and Answers

1.

Hypotheses convening the relative size of the means of two population are tested by...
- A.
  
  Sample value and P-value
- B.
  
  Critical Values and P-value
- C.
  
  Confidence Interval
- D.
  
  Point estimate and P-value
Correct Answer
B. Critical Values and P-value

Explanation
When testing hypotheses about the relative size of the means of two populations, critical values and p-values are used. Critical values are predetermined values that define the boundaries for rejecting or failing to reject the null hypothesis. P-value, on the other hand, is a statistical measure that quantifies the evidence against the null hypothesis. By comparing the test statistic to the critical values and calculating the corresponding p-value, we can determine if there is enough evidence to reject the null hypothesis and conclude that there is a significant difference in the means of the two populations.

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2.

Independent values are composed of groups that are in no way matched to them.
- A.
  
  Always true
- B.
  
  Often true
- C.
  
  Occasionally true
- D.
  
  Never true
Correct Answer
A. Always true

Explanation
This statement is always true because independent values are by definition not related or dependent on any other variables. They stand alone and are not influenced or affected by any other factors. Therefore, they are composed of groups that are in no way matched to them, making the statement always true.

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3.

A point estimate for the difference in two group population is the...
- A.
  
  Difference in different sample means
- B.
  
  Difference in standardised test statistics
- C.
  
  Similarities in different sample means
- D.
  
  Difference in corresponding sample means
Correct Answer
D. Difference in corresponding sample means

Explanation
The correct answer is "Difference in corresponding sample means." A point estimate is a single value that is used to estimate an unknown population parameter. In this case, the point estimate for the difference in two group populations would be the difference between the means of the corresponding samples from each group. By comparing the means of the two samples, we can estimate the difference in the means of the two populations they represent.

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4.

A dependent sample is one where two groups are formed from matched pairs.
- A.
  
  Always true
- B.
  
  Often true
- C.
  
  Occasionally true
- D.
  
  Never true
Correct Answer
A. Always true

Explanation
A dependent sample refers to a situation where two groups are formed from matched pairs. This means that the individuals in each group are related or connected in some way, such as being siblings, couples, or twins. In such cases, the observations or measurements taken from one individual in a pair are directly related to the observations or measurements taken from the other individual in the same pair. Therefore, it is always true that a dependent sample involves two groups formed from matched pairs.

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5.

Which of these is the procedure used to test hypotheses concerning a single population?
- A.
  
  3 steps
- B.
  
  4 steps
- C.
  
  5 steps
- D.
  
  6 steps
Correct Answer
C. 5 steps

Explanation
The 5-step procedure is used to test hypotheses concerning a single population. It involves: 1) stating the null and alternative hypotheses, 2) selecting a significance level, 3) calculating the test statistic, 4) determining the critical value or p-value, and 5) making a decision and interpreting the results. This procedure helps researchers to systematically analyze data and draw conclusions about a population based on sample data.

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6.

The null and alternative hypotheses will always be expressed in terms of...
- A.
  
  Similarities of the two population means
- B.
  
  Difference in confidence interval
- C.
  
  Differences of the two population means
- D.
  
  Similarities in confidence interval
Correct Answer
C. Differences of the two population means

Explanation
The null and alternative hypotheses are statements made about the population parameters that we want to test. In this case, the correct answer is "Differences of the two population means." This means that the hypotheses will be expressed in terms of the difference between the means of two populations. The null hypothesis typically states that there is no difference between the means, while the alternative hypothesis states that there is a difference. These hypotheses are used in hypothesis testing to determine if there is enough evidence to reject the null hypothesis and conclude that there is a significant difference between the means of the two populations.

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7.

The number s d is an estimate of the standard deviations σd of the population of differences.
- A.
  
  True
- B.
  
  False
- C.
  
  Not defined
- D.
  
  Depends on some factors
Correct Answer
A. True

Explanation
The statement is true because s d represents the standard deviation of the population of differences. This means that it is an estimate of the variability or spread of the differences between the values in the population. By calculating s d, we can gain insight into how much the individual values in the population differ from the mean. Therefore, the statement is correct.

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8.

Hypotheses testing is an integral part of research.
- A.
  
  True
- B.
  
  False
- C.
  
  Maybe
- D.
  
  Depends on some factors
Correct Answer
A. True

Explanation
Hypothesis testing is a crucial component of research as it allows researchers to evaluate the validity of their proposed hypotheses. It involves formulating a null hypothesis and an alternative hypothesis, collecting data, and using statistical analysis to determine whether the data supports or rejects the null hypothesis. By conducting hypothesis testing, researchers can make informed conclusions and contribute to the advancement of knowledge in their respective fields. Therefore, it is accurate to state that hypothesis testing is an integral part of research.

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9.

When the data are collected in pairs, the differences computed for each pair is...
- A.
  
  Different from the data used in formulas
- B.
  
  Different from the data used in confidence interval
- C.
  
  The data that are used in the formulas
- D.
  
  The data used in confidence interval
Correct Answer
C. The data that are used in the formulas

Explanation
The correct answer is "The data that are used in the formulas." When data are collected in pairs, the differences computed for each pair are used in the formulas. This means that the individual data points themselves are not used, but rather the differences between them. These differences are then used in various calculations and statistical formulas to analyze the data and draw conclusions.

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10.

The quantity sp2 is called the pooled sample variance.
- A.
  
  True
- B.
  
  False
- C.
  
  Maybe
- D.
  
  Depends on some factors
Correct Answer
A. True

Explanation
The quantity sp2 is called the pooled sample variance. This statement is true. The pooled sample variance is a measure of the variation within and between two or more groups or samples. It is calculated by combining the variances of each group, taking into account the size of each group. The pooled sample variance is commonly used in statistical analysis, such as in the analysis of variance (ANOVA) test.

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Current Version
Mar 20, 2023

Quiz Edited by
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Dec 27, 2017

Quiz Created by
Cripstwick

Difference Between Groups Using Two-sample Inference

Hypotheses convening the relative size of the means of two population are tested by...

Independent values are composed of groups that are in no way matched to them.

A point estimate for the difference in two group population is the...

A dependent sample is one where two groups are formed from matched pairs.

Which of these is the procedure used to test hypotheses concerning a single population?

The null and alternative hypotheses will always be expressed in terms of...

The number s d is an estimate of the standard deviations σd of the population of differences.

Hypotheses testing is an integral part of research.

When the data are collected in pairs, the differences computed for each pair is...

The quantity sp2 is called the pooled sample variance.