A medical researcher treats 400 subjects who have high cholesterol with a new dr

Question

A medical researcher treats 400 subjects who have high cholesterol with a new drug. The average decrease in cholesterol level is = 90 mg/dL after two months of taking the drug. Assume that the decrease in cholesterol after two months of taking the drug follows a Normal distribution, with unknown mean and standard deviation = 30. Which approach would produce a confidence interval with a smaller margin of error than the 95% confidence interval you computed above?

Compute a 99% confidence interval rather than a 95% confidence interval. The increase in confidence indicates that we have a better interval. Give the drug to only 100 subjects rather than 400, because 100 people are easier to manage and control. None of the above Give the drug to 500 subjects rather than 400.

Explanation / Answer

because larger sample size will give smaller moe

Give the drug to 500 subjects rather than 400.

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