statistics
A researcher is interested in estimating the difference in average salaries for fresh MBA graduates and fresh BAS graduates who are newly hired. The samples results are:
MBA BAS
n1 = 10 persons n2 = 10 persons
$1800
$1450 S1 = $80 S2 = $50
a) Check the assumption of common variance.
b) Find the pooled estimate of the common variance.
c) Calculate the 90% confidence interval for the difference in average salaries for fresh MBA graduates and fresh BAS graduates.