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

N1-40

=72 (in $1,000)

S1=6 (in $1,000)

West

N2=45

=78 (in $1,000)

S2=8 (in $1,000)

Question (1) Develop an interval estimate for the difference between the average yearly incomes of the marketing managers in the east and west - use a=0.05

Question (2) 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

I need help knowing to figure this out and show my work.