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A study was conducted to investigate the effect of physical training on the serum cholesterol level....

A study was conducted to investigate the effect of physical training on the serum cholesterol level. Thirty subjects participated in the study. Prior to training, blood samples were taken to determine the cholesterol level of each subject. Then the subjects were put through a training program that centered on daily running and jogging. At the end of the training period, blood samples were taken again and a second reading on the serum cholesterol level was obtained. Is there an effect of the training on cholesterol levels?

Subject Pre-training level x (mg/Dl) Post-training level x (mg/Dl)
1 182 198
2 232 210
3 191 194
4 210 210
5 148 135
6 249 220
7 276 219
8 213 161
9 241 210
10 480 303
11 262 220
12 420 205
13 240 150
14 210 320
15 184 150
16 81 207
17 190 215
18 225 272
19 400 145
20 412 198
21 212 159
22 230 245
23 183 291
24 278 150
25 192 211
26 11 22
27 332 245
28 342 290
29 210 254
30 312 207
Math   Statistics-And-Probability   
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