A study was conducted to determine the effect of a special diet on a person's cholesterol level. The data below are the cholesterol levels of a random sample of seven middle-aged adults who were on a regular diet and who agreed to adopt a special diet for one month. Cholesterol levels were taken before adopting the special diet and a month after. Subject 1 2 3 4 5 7 Before 196 144 203 161 240 245 After 140 153 180 145 211 200 Perform the appropriate test of hypothesis to determine if the special diet is effective in lowering cholesterol level. Assume that the differences between the cholesterol levels before adopting the diet and a month after follow the normal distribution. Use a 5% level of significance. A. Perform a complete test of hypothesis. B. Select here the conclusion for this test of hypothesis. The special diet is effective in lowering cholesterol level. There is no sufficient evidence to say that the special diet is effective in lowering cholesterol level. 6 169 145

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