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(1) Calculate a 95% confidence interval for the mean starting salary of all employees who stay (Yes) at least three years with D&Y.

(2)Calculate a 95% confidence interval for the mean starting salary of all employees who do not stay (No) at least three years with D&Y.

(3) Based on your findings on Part 1 and 2, does it appear the employees who do not stay at least 3 years are underpaid than the employees who do stay at least 3 years. Explain.