estigaté hów effective a new diet was in lowering cholesterol. Results for the randomly selected subjects are shown in the table. The differences have a normal distribution. Are the subjects' cholesterol levels lower on average after the diet ? Test at the 5% level. Before 209 210 205 198 216 | 217 238 240 222 After 199 206 190 189 208 202 211 223 201

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