A university investigation was conducted to determine whethe

A university investigation was conducted to determine whether women and men complete medical school in significantly different amounts of time, on the average. Two independent random samples were selected and the following summary information concerning times to completion of medical school computed: Women Men Sample Size 90 100 Sample Mean 8.4 years 8.5 years Sample Standard Deviation 0.6 years 0.5 years

Which test would be used?

A. T test

B. T test for the difference between two means

C. Z test

D. Z test for the difference between two means

Solution

B. T test for the difference between two means

because there are 2 samples involved, without unknown population standard devaitions.