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=133 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject)
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=133 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. A 99% confidence level requires subjects. (Round up to the nearest subject)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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
Transcribed Image Text: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 = 13.3 based on earlier studies? Suppose the doctor would be content
with 95% confidence. How does the decrease in confidence affect the sample size required?
Click the icon to view a partial table of critical values.
A 99% confidence level requires
subjects. (Round up to the nearest subject.)

Transcribed Image Text:Partial Critical Value Table
Level of Confidence,
(1-α) 100%
90%
95%
99%
Area in Each Tail,
0.05
0.025
0.005
XX Critical Value, Zα/2
2
1.645
1.96
2.575
X
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