Question Help 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 4 points with 99% confidence assuming s= 13.9 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? E Click the icon to view a partial table of critical values A 99% confidence level requires subjects. (Round up to the nearest subject) A 90% confidence level requires subjects. (Round up to the nearest subject) How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level decreases the sample size needed. O B. Decreasing the confidence level increases the sample size needed. O C. The sample size is the same for all levels of confidence.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 14PPS
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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 4 points with 99% confidence assuming s = 13.9 based on earlier
studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required?
%3D
Click the icon to view a partial table of critical values.
A 99% confidence level requires
subjects. (Round up to the nearest subject.)
A 90% confidence level requires subjects. (Round up to the nearest subject.)
How does the decrease in confidence affect the sample size required?
O A. Decreasing the confidence level decreases the sample size needed.
O B. Decreasing the confidence level increases the sample size needed.
O C. The sample size is the same for all levels of confidence.
Transcribed Image Text:Question Help 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 4 points with 99% confidence assuming s = 13.9 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? %3D Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject.) A 90% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level decreases the sample size needed. O B. Decreasing the confidence level increases the sample size needed. O C. The sample size is the same for all levels of confidence.
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