1 In order to estimate the difference between the yearly inc

1. 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. East West n1 = 40 n2 = 45 = 72 (in $1,000) = 78 (in $1,000) s1 = 6 (in $1,000) s2 = 8 (in $1,000) df=80 a. What is the point estimate of the difference between the two population means? b. At 90 % confidence, what is the margin of error? c. What is the 90 % confidence interval for the difference between the two population means? d. Use p-value approaches to test to determine if the average yearly income of marketing managers in the East is significantly different from the West. Use =0.10

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