CareerBank.com conducts an annual salary survey of accounting, finance, and banking professionals. For one survey, data were collected for 2,800 responses submitted online by professionals across the country who voluntarily responded to Career Bank.com's Web-based survey. Salary comparisons were made by gender, education, and marital status. Some of the results are shown in the accompanying table.

a. Suppose you want to make an inference about the difference between the mean salaries of male and female accounting/finance/banking professionals at a 95% level of confidence. Why is this impossible to do using the information in the table?
b. Give values of the missing standard deviations that would lead you to conclude that the mean salary for males is significantly higher than the mean salary for females at a 95% level of confidence.
c. In your opinion, are the sample standard deviations, part b, and reasonable values for the salary data? Explain.
d. How does the data-collection method impact any inferences derived from the data?

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Males Females Mean Salary Number of Respondents $69,848 1,400 $52,012 1,400