1. A medical researcher needs to estimate the mean cholesterol level for the adults in her area. If she wants to be 99% confident that the margin of e

1. A medical researcher needs to estimate the mean cholesterol level for the adults in her area. If she wants to be 99% confident that the margin of error is within 0.2 mg/dL (milligrams per deciliter), and the population standard deviation is known to be 4mg/dL, find the minimum sample size needed for the study.2. Two math students decide to estimate the proportion of students who work outside school by interviewing their peers. How many students must be interviewed so that they can estimate this proportion with 95% confidence and a margin of error no greater than 3%?

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