Let's say we collect a sample of 50 height measurements from male students at Harvard.

Suppose we are given data from 1980 that said the average height of male Harvard

students was 69" (5'9") and with a standard deviation of 2.5". We assume the standard

deviation is still the same but now get a sample mean of 68" (5'8"). Perform a test to see

if the mean of height of current Harvard students is truly different than the average from

1980 at the 0.1 significance level