As a new Human Resources (HR) director, you found from a random sample of 16 people who left your firm that they had an average stay of 5 years at your firm with a population standard deviation of2 years. If you are to construct a 95% confIdence interval for an average job length for your employees, it is best for you to use __ and __ years.
a. a Z value; a standard deviation of 2
b. a t value; a standard deviation of 2
c. a Z value; a standard error of 0.125
d. a t value; a standard error of 0.125
e. a Z value; a standard error of 0.5
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