How does the decrease in confidence affect the sample size


A doctor wants to estimate the HDL cholesterol of all 20-29 year old females. How many subjects are needed to estimate the HDL cholesterol within 4 points with 99% confidence assuming stdv=18.3? Suppose the doctorwould be content with 90%confidence. How does the decrease in confidence affect the sample size required?

A. 99% confident level requires ------- subjects

B. 90% confident level requires--------subjects

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Applied Statistics: How does the decrease in confidence affect the sample size
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