Question: An exhaustive survey of all users of a wilderness park taken in 1960 revealed that the average number of persons per party was 2.6. In a random sample of 25 parties in 1985, the average was 3.2 persons with a standard deviation of 1.08.
a. Test the hypothesis that the number of persons per party has changed in the intervening years.
b. Determine the corresponding PROB-VALUE.