As a new Human Resources (HR) director, you found from a random sample of 36 people who left your firm that they had an average stay of 4 years at your firm with a sample standard deviation of 3 years. Because your boss wishes to know with a 99% confidence that your employees are staying the industry average, you construct a 99% confidence interval for an average job length for your employees as
a. between 1 and 7 years
b. between 2.55 and 7.45 years
c. between 3.5 and 4.5 years
d. between 2.64 and 5.36 years
e. between 3.77 and 4.23 years
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