Question

	Yahoo	Google	Facebook	LinkedIn	Total
Males	129	560	77	51	817
Females	76	540	34	33	383
Total	205	800	111	84	1200

We will focus on Yahoo and Google.

1. Yahoo prides itself on reaching out to women. Test to see if the proportion of Women in the workforce for Yahoo is different from the industry level of .31 (this is the industry level not including Yahoo). This is a single proportion problem.   Show the calculation of the standard error and the test statistic, as well as all the steps in your test. Use an alpha level of .05.Would it have made a difference in Part a if we expressed the test as a one-tailed, upper test? Explain why does or does not make a difference.
2. Next let’s do a difference of proportion test between Yahoo and Google to see if we have evidence that the proportion of women working at Yahoo is higher that that at Google. Use alpha = .05. Show the calculation of the standard error and the test statistic, as well as all the steps in your test.

Answer 1