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(All Steps) Four individuals with high levels of cholesterol went on a special diet, avoiding high-cholesterol foods and taking special supplements. Their

Question: Four individuals with high levels of cholesterol went on a special diet, avoiding high-cholesterol foods and taking special supplements. Their total cholesterol levels before and after the diet were:

Obs. Before After
1 287 255
2 305 269
3 243 245
4 309 247

Using the .05 level of significance, was there a significant change in cholesterol level? (a) Use the steps of hypothesis testing. (b) Sketch the distributions involved. (c) Explain your answer to someone who has never taken a course in statistics.

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