In a study to determine whether counseling could help people lose weight, a sample of people experienced a group-based behavioral intervention, which involved weekly meetings with a trained interventionist for a period of six months. The following data are the numbers of pounds lost for 14 people. Assume the population is approximately normal. Perform a hypothesis test to determine whether the mean weight loss is greater than 15 pounds. Use the α = 0.01 level of significance and the P-value method with the TI-84 Plus calculator. 22.9 28.8 8.1 24.4 21.7 13.4 17.6 21.5 37.8 34.1 12.6 36.8 24.6 19.9  Compute the P-value. Round the answer to at least four decimal places.   P-value = ___     How do I solve this problem using TI-84 calculator?

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