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A medical researcher treats 400 subjects with high cholesterol with a new drug. The average decrease...

A medical researcher treats 400 subjects with high cholesterol with a new drug. The average decrease in cholesterol level is = 90 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 μ and standard deviation σ = 30.

Which scenario would produce a confidence interval with a smaller margin of error than a 95% confidence interval of 90 ± 2.94?
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