1. When is it appropriate to use the one-sample Z-test? When sample size is large enough n-30. The distribution approaches normal as the sample size grows, therefore z test is applicable 2. What's with the z in Z-test? What similarity does it have to a simple z or standard score? 3. For the following situations, write out in words a research hypothesis: a. Bob wants to know whether the weight loss for his group on the chocolate-only diet is representative of weight loss in a large population of middle-aged men. b. The health department is charged with finding out whether the rate of flu per thousand citizens during this past flu season is comparable to the average rate during the past 50 seasons c. Blair is almost sure that his monthly costs for the past year are not representative of his average monthly costs over the past 20 years