The average of serum cholesterol levels in a group of 20 Lebanese was 210 mg/dl and the Standard deviation of this sample was 11mg/dl. a) Estimate the population mean by constructing a confidence interval 95%. b) Will the interval be broader (larger) or narrower when using a = 0.01?

A First Course in Probability (10th Edition)
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Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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The average of serum cholesterol levels in a group of 20 Lebanese was 210 mg/dl and
the
Standard deviation of this sample was 11mg/dl.
a) Estimate the population mean by constructing a confidence interval 95%.
b) Will the interval be broader (larger) or narrower when using a = 0.01?
Transcribed Image Text:The average of serum cholesterol levels in a group of 20 Lebanese was 210 mg/dl and the Standard deviation of this sample was 11mg/dl. a) Estimate the population mean by constructing a confidence interval 95%. b) Will the interval be broader (larger) or narrower when using a = 0.01?
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