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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola
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Effectiveness of Diet. Listed below are weights (lb) of

Chapter 10, Problem 1 CRE

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QUESTION:

Problem 1 CRE

Effectiveness of Diet. Listed below are weights (lb) of subjects before and after the Zone diet. (Data are based on results from “Comparison of the Atkins, Ornish, Weight Watchers, and Zone Diets for Weight Loss and Heart Disease Risk Reduction, “ by Dansingeret al, Journal of the American Medical Association, Vol. 293, No. 1.) Use the data for Exercises.

Before

183

212

177

209

155

162

167

170

After

179

198

180

208

159

155

164

166

Diet Clinical Trial: Statistics Find the mean and standard deviation of the “before — after” differences.

Questions & Answers

QUESTION:

Problem 1 CRE

Effectiveness of Diet. Listed below are weights (lb) of subjects before and after the Zone diet. (Data are based on results from “Comparison of the Atkins, Ornish, Weight Watchers, and Zone Diets for Weight Loss and Heart Disease Risk Reduction, “ by Dansingeret al, Journal of the American Medical Association, Vol. 293, No. 1.) Use the data for Exercises.

Before

183

212

177

209

155

162

167

170

After

179

198

180

208

159

155

164

166

Diet Clinical Trial: Statistics Find the mean and standard deviation of the “before — after” differences.

ANSWER:

Answer

Step 1 of 3

Before

After

Before — After=d

(d-)2 

183

179

4

0.5625

212

198

14

115.5625

177

180

-3

39.0625

209

208

1

5.0625

155

159

-4

52.5625

162

155

7

14.0625

167

164

3

0.0625

170

166

4

0.5625

d=26

(d-)2  =227.5

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