Question 1 of 20

5.0 Points 
The __________ test is useful for before/after experiments.

A. goodnessoffit 


B. sign 


C. median 


D. chisquare 

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Question 2 of 20

5.0 Points 
The __________ test is useful for drawing conclusions about data using nominal level of measurement.

A. goodnessoffit 


B. sign 


C. median 


D. chisquare 

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Question 3 of 20

5.0 Points 
In an experiment, a sample size of 10 is drawn, and a hypothesis test is set up to determine: H
_{0} : p = 0.50; H
_{1}:p < or = 0.50; for a significance level of .10, the decision rule is as follows:

A. Reject H_{0} if the number of successes is 2 or less. 


B. Reject H_{0} if the number of successes is 8 or more. 


C. Reject H_{0} if the number of successes is three or less. 


D. Reject H_{0} if the number of successes is less than 2 or more than 8. 

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Question 4 of 20

5.0 Points 
For a “before and after” test, 16 of a sample of 25 people improved their scores on a test after receiving computerbased instruction. For H
_{0} : p = 0.50; H
_{1}:p is not equal to 0.50; and a significance level of .05:

A. z = 1.2, fail to reject the null hypothesis. 


B. z = 1.4, reject the null hypothesis. 


C. z = 1.4, fail to reject the null hypothesis. 


D. z = 1.64, reject the null hypothesis. 

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Question 5 of 20

5.0 Points 
A sample group was surveyed to determine which of two brands of soap was preferred. H
_{0} :p = 0.50; H
_{1}: p is not equal to 0.50. Thirtyeight of 60 people indicated a preference. At the .05 level of significance, we can conclude that:

A. z = 0.75, fail to reject H_{0}. 


B. z = 1.94, fail to reject H_{0}. 


C. z = 1.94, reject H_{0}. 


D. z = 2.19, reject H_{0}. 

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Question 6 of 20

5.0 Points 
The performance of students on a test resulted in a mean score of 25. A new test is instituted and the instructor believes the mean score is now lower. A random sample of 64 students resulted in 40 scores below 25. At a significance level of Î± = .05:

A. H_{0} : p = 0.50; H_{1}:p < 0.50. 


B. H_{0} : p = 0.50; H_{1}:p > 0.50. 


C. H_{0} : p = 25; H_{1}:p > 25. 


D. H_{0} : p = 25; H_{1}:p < 25. 

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Question 7 of 20

5.0 Points 
From the information presented in question #6:

A. z = 3.75, we can reject the null hypothesis. 


B. z = 1.875, we fail to reject the null hypothesis. 


C. z = 1.625, we fail to reject the null hypothesis. 


D. z = 1.875, we can reject the null hypothesis. 

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Question 8 of 20

5.0 Points 
A golf club manufacturer claims that the median length of a drive using its driver is 250 yards. A consumer group disputes the claim, indicating that the median will be considerably less. A sample of 500 drives is measured; of these 220 were above 250 yards, and none was exactly 250 yards. The null and alternate hypotheses are:

A. H_{o}: 0 = 250; H_{1}: 0 < 250. 


B. H_{o}: median = 250; H_{1}: median > 250. 


C. H_{o}: 0 > 250; H_{1}: 0 < 250. 


D. H_{o}: median = 250; H_{1}: median < 250. 

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Question 9 of 20

5.0 Points 
From the information presented in question #8, using a level of significance = .05:

A. z = 1.74; we should fail to reject the null hypothesis. 


B. z = 2.64; we should fail to reject the null hypothesis. 


C. z = 2.72; we should fail to reject the null hypothesis. 


D. z = 3.17; we should reject the null hypothesis. 

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Question 10 of 20

5.0 Points 
The Wilcoxon ranksum test:

A. is a nonparametric test for which the assumption of normality is not required. 


B. is used to determine if two independent samples came from equal populations. 


C. requires that the two populations under consideration have equal variances. 


D. Both A and B 

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Question 11 of 20

5.0 Points 
A nonparametric test which can evaluate ordinalscale data of a nonnormal population is called the:

A. Wilcoxon signed rank test. 


B. KruskalWallis test. 


C. sign test. 


D. median test. 

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Question 12 of 20

5.0 Points 
A researcher wishes to test the differences between pairs of observations with a nonnormal distribution. She should apply the:

A. Wilcoxon signed rank test. 


B. KruskalWallis test. 


C. Wilcoxon ranksum test. 


D. t test. 

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Question 13 of 20

5.0 Points 
The data below indicate the rankings of a set of employees according to class theory and onthejob practice evaluations:
Theory 
1 
7 
2 
10 
4 
8 
5 
3 
6 
9 
Practice 
2 
8 
1 
7 
3 
9 
6 
5 
4 
10 
What is the Spearman correlation of coefficient for the data?
