In a test of the Atkins weight loss program, 40 individuals participated in a randomized trial with overweight adults. After 12 months, the mean weight loss was found to be 2.1 lb, with a sample standard deviation of 4.8 lb.

a. What is the best point estimate of the population mean weight loss of all overweight adults who follow the Atkins program?
b. Construct a 99% confidence interval estimate of the mean weightloss for all such subjects.
c. Does the Atkins program appear to be effective? Is itpractical?