Example: Weight Watchers When 40 people used the Weight Watchers diet for one year, their mean weight loss was 3.0 lb and the standard deviation was 4.9 lb (based on data from "Comparison of the...

Extracted text: Example: Weight Watchers When 40 people used the Weight Watchers diet for one year, their mean weight loss was 3.0 lb and the standard deviation was 4.9 lb (based on data from "Comparison of the Atkins, Omish, Weight Watchers, and Zone Diets for Weight Loss and Heart Disease Reduction" by Dansinger et al). Use a 0.01 significance level to test the claim that the mean loss is greater than 0. Assume that a simple random sample has been selected. Complete the following: The null and alternative hypothesis: • Họ: H1: Identify the sample statistic for this hypothesis test: T-stat or Z-stat? Is the test two-tailed, left-tailed, or right-tailed? Give the df: Find the Critical Regions (graph) and Critical Values for a=0.01 Identify the P-value and test stat: Do we reject or fail to reject Explain your answer.