In a study of court administration, the following times to disposition were determined for twenty cases and found to be
42, 90, 84, 87, 116, 95, 86, 99, 93, 92, 121, 71, 66, 98, 79, 102, 60, 112, 105, 98.
Test the hypothesis that the average time to disposition is less than or equal to 80, using α = .01.