QUESTION 13 1. Data were collected on annual personal time (in hours) taken by a

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QUESTION 13 1. Data were collected on annual personal time (in hours) taken by a random sample of 16 women (group1) and 7 men (group 2) employed by a medium sized company. The women took an average of 24.75 hours of personal time per year with a standard deviation of 2.84 hours. The men took an average of 21.89 hours of personal time per year with a standard deviation of 3.29 hours. The Human Resources Department believes that women tend to take more personal time than men because they tend to be the primary child care givers in the family. The results of the test are t = 2.02 with an associated P-value of 0.0352. The correct conclusion at 0.05 is to A.reject the null hypothesis B.fail to reject the null hypothesis C. conclude that women take a higher average number of hours of personal time per year compared to men. D. Both A and C QUESTION 15 A mid-sized company has decided to implement an enterprise resource planning (ERP) system, and management suspects that many of its employees are concerned about the planned implementation. Managers are considering holding informational workshops to help decrease anxiety levels among employees. To determine whether such an approach would be effective, they randomly select 16 employees to participate in a pilot workshop. These employces were given a questionnaire to measure anxiety levels about ERP before and after participating in the workshop. To determine if anxiety levels about ERP decreases as a result of the workshop, they should use a 1. A. two-tailed test of two independent means. B. one-tailed test of two independent means. C. one-tailed paired t-test. D. two-tailed one sample t-test.

Explanation / Answer

13)

Since p value = 0.0352

And alfa = 0.05

Here p value < 0.05

The result is significant at alfa=0.05

We reject the null hypothesis and believe that women take higher average number of hours of personal time per year compared to men

Ans: both a and c

Option D

15) we use one tailed paired t test

Option c

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