1. A study was conducted to investigate whether a macrobiotic diet lowers serum cholesterol. Suppose it is known that in the general population the mean serum cholesterol level is 195 mg/dl. A simple random sample of 100 people from this population was given the macrobiotic diet, and after the diet regimen was completed, the sample mean serum cholesterol level was found to be 180 mg/dl and the sample standard deviation was 52 mg/dl. Let μ denote the mean serum cholesterol level for all people …
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