Dr. Mack Lemore, an expert in consumer behavior, wants to
estimate the average amount of money that people spend in thrift
shops. He takes a small sample of 8 individuals and asks them to
report how much money they had in their pockets the last time they
went shopping at a thrift store. Here is the data:
28.24, 28.39, 32.85, 19.96, 24.74, 13.88,
17.9, 24.41.
He wishes to test the null hypothesis that the average amount of
money people have...