TABLE 10-7
A buyer for a manufacturing plant suspects that his primary supplier of raw materials is overcharging.In order to determine if his suspicion is correct,he contacts a second supplier and asks for the prices on various identical materials.He wants to compare these prices with those of his primary supplier.The data collected is presented in the table below,with some summary statistics presented (all of these might not be necessary to answer the questions which follow).The buyer believes that the differences are normally distributed and will use this sample to perform an appropriate test at a level of significance of 0.01.
-The Wall Street Journal recently published 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 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 compared to 62% of the women responded "Yes." Assuming W designates women's responses and M designates men's,what hypothesis should The Wall Street Journal test in order to show that its claim is true?

Question

TABLE 10-7
A buyer for a manufacturing plant suspects that his primary supplier of raw materials is overcharging.In order to determine if his suspicion is correct,he contacts a second supplier and asks for the prices on various identical materials.He wants to compare these prices with those of his primary supplier.The data collected is presented in the table below,with some summary statistics presented (all of these might not be necessary to answer the questions which follow).The buyer believes that the differences are normally distributed and will use this sample to perform an appropriate test at a level of significance of 0.01. 
-The Wall Street Journal recently published 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 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 compared to 62% of the women responded "Yes." Assuming W designates women's responses and M designates men's,what hypothesis should The Wall Street Journal test in order to show that its claim is true?

Quizplus · Accepted Answer

The hypothesis that should be tested is whether women perceive sexual harassment to be more prevalent in the workplace than men. This can be expressed as a one-tailed test where the alternative hypothesis is that the proportion of women who perceive sexual harassment to be a major problem in the workplace is greater than the proportion of men who perceive it to be a major problem. Therefore, the null hypothesis should be that there is no difference in perception between men and women, i.e. πW - πM ≤ 0, and the alternative hypothesis should be that women have a higher proportion than men, i.e. πW - πM > 0. Thus, option B is the correct choice.

TABLE 10-7 A Buyer for a Manufacturing Plant Suspects That His Primary