Question

In a test of the Weight Watchers diet program, 45 individuals participated in a randomized trial with overweight adults. After 12 months, the mean weight loss was found to be 7.1 pounds with a standard deviation of 2.8 pounds.

a. Construct a 95% confidence interval estimate of the mean weight loss of all overweight adults who use Weight Watchers.

b. Find the margin of error.

c. Does the Weight Watchers program appear to be effective? Explain

Answer 1