A weight loss program claims that program participants have a
mean weight loss of at least 10 pounds after 1 month. You work for
a medical association and are asked to test this claim. A random
sample of 30 program participants and their weight losses (in
pounds) after 1 month is listed in the table below. Assume the
population standard deviation is 3. At α = 0.01, is there enough
evidence to reject the program's claim?
Samples: 4.7, 6.0, 7.2,...