1. Do motivation levels between Japanese and American managers differ? A randomly selected group of each were administered the Sarnoff Survey of Attitudes Toward Life (SSATL), which measures motivation for upward mobility. The SSATL scores are summarized below:

Judging from the way the data were collected, which experimental design was employed?

This is a randomized block study. The answer is (3).

2. The newspaper recently ran an article indicating differences in perception of sexual harassment on the job between men and women. The article claimed that women perceived the problem to be much more prevalent than did the men. One question asked of both men and women was "Do you think sexual harassment is a major problem in the American workplace?" 24% of the men and 62% of the women responded "Yes." What hypothesis should the newspaper test in order to show that its claim is true?

I think that the alternative hypothesis should be that women perceived the problem to be much more prevalent than did the men (one sided test). In mathematical terms, this would be pw > pm, or pw - pm > 0, or pm - pw < 0. The null hypothesis is the opposite: pm - pw is greater than or equal to 0. This answer is not in the list.

If the newspaper chooses to do a two-sided test, the alternative hypothesis whould be that a different percentage of women than men perceived sexual harassment as a problem. In this case, the alternative hypothesis is pm &#8800; pw, or pm - pw &#8800; 0. The null hypothesis is the opposite: pm - pw = 0. The answer is (3).

3. A researcher wants to determine if gender differences exist in the area of domestic violence. The researcher surveyed 1000 men and 1000 women and asked each if they felt that domestic violence was a major concern in today's society. Two hundred fifty of the men and 400 of the women responded by saying they did feel domestic violence was a major concern. What criterion is used to assess whether the Central Limit Theorem can be applied to this problem?

The central limit theorem says that if a large number of random samples of size n are chosen from virtually any population (with mean µ and standard deviation s), the means of these samples will themselves follow a normal distribution.

An assumption is that the samples are independent. The answer is (1).