In Order to Estimate the Difference Between the Yearly Incomes $\alpha$

Essay

In order to estimate the difference between the yearly incomes of marketing managers in the East and West of the United States,the following information was gathered.

a.Develop an interval estimate for the difference between the average yearly incomes of the marketing managers in the East and West.Use $\alpha$ = 0.05.
b.At 95% confidence,use the p-value approach and test to determine if the average yearly income of marketing managers in the East is significantly different from the West.