The data represent the weight of twenty-five people who went on a prescribed die

Question

The data represent the weight of twenty-five people who went on a prescribed diet at the beginning of a one- year time period. The Before weights are their weights at the start of the program and After sre their weights one year later.

a) Use the formula below to test the hypothesis that weight before equals weight after against the alternative that weight after is less than before, and indicate your conclusion.

T = d¯ xb-xa/ S.E. d¯

Person Before After 1 173 164 2 192 191 3 185 176 4 177 176 5 196 189 6 178 169 7 196 196 8 181 172 9 158 158 10 201 193 11 191 185 12 193 190 13 176 175 14 212 210 15 177 173 16 183 180 17 211 204 18 198 192 19 157 152 20 213 209 21 161 153 22 177 168 23 210 203 24 192 186 25 178 170

Explanation / Answer

The data represent the weight of twenty-five people who went on a prescribed die

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