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Category > Math Posted 27 Aug 2017 My Price 10.00

The director for weight watchers International wants to determine if the changes in their program results in better weight loss.

The director for weight watchers International wants to determine if the changes in their program results in better weight loss. She selected 25 weight watcher members at random and compared their weight 6 months later to weight at start of the program. The result are in the excel file below:

 

 

Person

Before

After

 

 

 

 

1

176

164

 

 

 

 

2

192

191

 

 

 

 

3

185

176

 

 

 

 

4

177

176

 

 

 

 

5

196

185

 

 

 

 

6

178

169

 

 

 

 

7

196

196

 

 

 

 

8

181

172

 

 

 

 

9

158

158

 

 

 

 

10

201

193

 

 

 

 

11

191

185

 

 

 

 

12

193

189

 

 

 

 

13

176

175

 

 

 

 

14

212

210

 

 

 

 

15

177

173

 

 

 

 

16

183

180

 

 

 

 

17

210

204

 

 

 

 

18

198

192

 

 

 

 

19

157

152

 

 

 

 

20

213

200

 

 

 

 

21

161

161

 

 

 

 

22

177

166

 

 

 

 

23

210

203

 

 

 

 

24

192

186

 

 

 

 

25

178

170

 

 

 

 

 

 

 

 

 

 

 

(The weight in the column labeled “After” represents their weights size months later and “Before” represents their weight at the start of the six-month period). The director used .05 as the significance level.

 

Use Excel to test. For each paired difference, compute After-Before. In Data Analysis, t-test: Paired Two Sample for means, select the After data for variable 1 Range. Note that the critical value output b Data Analysis for this test is always positive. In this problem, the sign of the critical value is negative corresponding to a 1-tailed test with lower reject region and negative lower critical value.

 

What are Null and alternate Hypotheses?

 

  1. H0: After-Before = 0; HA: After – Before ≠ 0.
  2. H0: After – Before ≥ 0; HA: After – Before > 0
  3. H0: After – Before > 0; HA; After – Before ≤ 0
  4. H0: After – Before ≥ 0; HA: After – Before < 0

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Status NEW Posted 27 Aug 2017 11:08 AM My Price 10.00

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