Shed Wate Inc. claims that with its new weight control program, average weight loss over the full span of the program is at least 28 lbs. You suspect the average is lower and plan to take a sample of 60 Shed Wate customers to test the company’s claim. You will use Shed Wate’s claim as the null hypothesis and a significance level of .01. Indicate and explain your decision for each of the following cases:
a. The p value for the sample mean is .046.
b. z stat for the sample mean is – 1.67.
c. The sample mean is 26.2 lbs. Assume the population standard deviation is 8 lbs.