A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s=17.8 based on earlier​ studies? Suppose the doctor would be content with 99% confidence. How does the decrease in confidence affect the sample size​ required? a. A​ 99% confidence level requires _______ subject. b. 90% confidence level requires ________ subject. c.How does the decrease in confidence affect the sample size​ required? a.Decreasing the confidence level decreases the sample size needed.   b.Decreasing the confidence level increases the sample size needed.   c.The sample size is the same for all levels of confidence.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.