In tills exercise you get practice in combining the ideas of

In tills exercise, you get practice in combining the ideas of estimation in unit 6 and the z-score methods that you learned in unit 5. See notes Unit 6. Estimation, page 31 The National Health and Nutrition Examination Survey of 1975-1980 give the following data on serum cholesterol levels in US males Suppose the distribution of serum cholesterol is normal in each age group. If you draw simple random samples of size 50 from each of the two groups. what is the probability that the difference between the two sample means (Group 2 mean Group 1 mean) will be more than 25? Source National Center or Health Statistics. R fulwood w Kalsbeek. B Rifkind. et al. Total serum cholesterol levels of adults 20- 74 years of age: United States,. 1976-1980\" Vital and Health Statistics Series II. No 236 DHHS Pub No(PHD) S6-I6S6. Public Health Service, Washington, DC, US Government Printing Office. May I9S6. Cited in Daniel (p 140, 5.4 1 Copyright 1999 by John Wiley & Sons, Inc By permission of John Wiley a

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