Use the information given in question 53 and test, at the 5 % level of significance, the alternative hypothesis that the mean weight loss is at least 4 lb.

Question 53

A diet center claims that people subscribing to its program lose an average of 4 lb in the first week of the diet. Suppose 25 people in the diet center’s program are chosen at random and are found to have lost 4.3 lb in the first week with a sample standard deviation of 1.1 lb. Test, at the 5 % level of significance, the hypothesis that the mean weight loss is 4 lb.