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 = 19,6 b tudies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? B Click the icon to view a partial table of critical values A 99% confidence level requires subjects. (Round up to the nearest subject.) A Partial Critical Value Table A 95% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? Critical Value, Za/2 Level of Confidence, (1-a) • 100% Area in Each Tail, O A. Decreasing the confidence level increases the sample size needed. 90% 95% 99% 0.05 0.025 0.005 1.645 1.96 2.575 O B. Decreasing the confidence level decreases the sample size needed. O C. The sample size is the same for all levels of confidence Print Done Click to select your answer(S).

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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 = 19.6 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.)
1 Partial Critical Value Table
A 95% confidence level requires
subjects. (Round up to the nearest subject.)
How does the decrease in confidence affect the sample size required?
Level of Confidence,
(1-a) • 100%
Critical Value, Za/2
Area in Each Tail,
O A. Decreasing the confidence level increases the sample size needed.
2
0.05
0.025
0.005
1.645
1.96
90%
O B. Decreasing the confidence level decreases the sample size needed.
95%
99%
O C. The sample size is the same for all levels of confidence.
2.575
Print
Done
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00
5
%24
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 = 19.6 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.) 1 Partial Critical Value Table A 95% confidence level requires subjects. (Round up to the nearest subject.) How does the decrease in confidence affect the sample size required? Level of Confidence, (1-a) • 100% Critical Value, Za/2 Area in Each Tail, O A. Decreasing the confidence level increases the sample size needed. 2 0.05 0.025 0.005 1.645 1.96 90% O B. Decreasing the confidence level decreases the sample size needed. 95% 99% O C. The sample size is the same for all levels of confidence. 2.575 Print Done Click to select your answer(s). 10:10 AM P Type here to search 5/6/2021 hp f5 f6 18 1A4 insert prt sc delete f3 esc %23 & backspace hom 3 6 7 T U D F G 00 5 %24
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