A manager of an electronic Company considers that his company
manages to retain employees for a longer period of time than other
similar companies. He claims that the mean time (in years) for his
employees to stay at his company is at least 3 years.
To prove his claim, a random sample of 36 employees is
used. The standard deviation is 2; sample average time is
2.25 and alpha is set at 0.05 significance level.
(a) Perform a z-test approach to test the hypothesis.
(b) Alternatively, use the p-value approach to test the above
hypothesis.