1.The director for Weight Watchers International wants to determine if


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1.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 theirweight 6 months later to weight at the start of the progr

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1.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 theirweight 6 months later to weight at the start of the program. Here are the results: (The weight in the column labeled "After" represents their weights six 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 H0: After - Before ? 0 vs. HA: After - Before < 0. 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 by 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. State your conclusion Excel doc. 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 2.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 by Data Analysis for this test is always positive. In this proble, the sign of the critical value is negative corresponding to a 1-tailed tesgt with lower reject region and negative lower critical value. What is the t-statistic (t-score)?

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