Some investigators believe that the effects of diet on cholesterol are more evident in people with high rather than low cholesterol levels. If you split the data in Table 2.15 according to whether baseline cholesterol is above or below the median, can you comment descriptively on this issue? 

Table 2.15 Serum-cholesterol levels (mg/dL) before and after adopting a vegetarian diet

*Before €“ after.

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Subject Before After Difference* 1 195 146 49 -10 145 155 178 3 205 27 146 4 159 13 5 244 208 36 166 147 19 250 202 48 236 215 21 192 184 10 224 208 16 206 11 238 32 169 12 197 28 13 169 182 -13 14 158 127 31 149 15 151 16 197 178 19 17 180 161 19 18 222 187 35 168 176 19 -8 20 168 145 23 154 21 167 13 22 161 153 8. 23 178 137 41 24 137 125 12