Determine the median

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Reference no: EM1321562

Question: A weight-loss program guarantees, "You'll lose weight within two weeks or we'll refund your money plus $10!" Using α = 5%, perform the sign test of the median paired difference to determine whether the median weight of these twelve participants decreased.

 

Weight

Weight

 

 

Person

Before

After

 

 

Ann

150

152

 

 

Bob

213

214

 

 

Chris

249

238

 

 

Debby

114

115

 

 

Earl

144

144

 

 

Fred

132

133

 

 

Gary

187

188

 

 

Helen

163

164

 

 

Ira

210

204

 

 

Jessie

195

196

 

 

Kim

124

125

 

 

Linda

228

229

 

 

In a two-tailed sign test the observed value of the test statistic is the number of the less frequent sign: the smaller of n (+) the number of +'s or n (-) the number of -'s.

IN A ONE-TAILED SIGN TEST the test statistic may be n (+) or n (-), DEPENDING ON WHICH WAY YOU SUBTRACT!

Reference no: EM1321562

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