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A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many subjec

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A doctor wants to estimate the HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 2 points with 90% confidence assuming sigma = 15.6? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?

A 99% confidence level requires __ subjects.

A 95% confidence level requires __ subjects.

Sample Size for 90% CI, E = 2 and ? = 15.6


Confidence level = 90% and Desired Margin of Error, E = 2.


Minimum sample size is given by:








P (|¯


x ? µ| < E) ? 1 ? ? ? P ( ?...


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