Historically, Stat 2480 students average 80 points on midterms.
One section earned the following scores: 90, 78, 73, 62, 77, 75, 61, 63, 68, 78, 75, 80, 87, 73, 78, 75, 78, 88, 70.
Assume the test scores for the section represent a random sample from a normally distributed population.
Test whether the section's scores were significantly different from 80 (alpha=.05)