Level of Confidence,(1-x) 100%90%95%99%Area in Each Tail,0.050.0250.005a2Critical Value, Za/21.6451.962.575 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 HDLcholesterol within 4 points with 99% confidence assuming s= 15.5 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 requiressubjects. (Round up to the nearest subject.)

Answered: Image /qna-images/answer/5a6be747-d40f-44fe-bbbb-11dffac4128a.jpg

Answered: A doctor wants to estimate the mean HDL…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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People were polled on how many books they read the previous year. Initial survey results indicate that s =11.3 books. Complete parts (a) through (d) below. E Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) Enter your answer in the answer box and then click Check Answer. 4 parts remaining Clear All DI DD 80 F7 F8 esc F5 F6 F1 F2 F3 F4 @ #3 $ % & 3 4 5 8.
People were polled on how many books they read the previous year. Initial survey results indicate that s = 19.9 books. Complete parts (a) through (d) below. Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) Partial Critical Value Table (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? Level of Confidence, Critical Value, Za/2 (1- a) • 100% Area in Each Tail, 2 A. Doubling the required accuracy nearly quadruples the sample size. 90% 0.05 1.645 B. Doubling the required accuracy nearly doubles the sample size. 95% 0.025 1.96 99% 0.005…
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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 3 points with 99% confidence assuming s= 14.5 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 view a partial table of critical values. A 99% confidence level requires 155 subjects. (Round up to the nearest subject.) A 90% confidence level requires subjects. (Round up to the nearest subject.) A Partial Critical Value Table Level of Confidence, (1-a) - 100% Critical Value, z12 Area in Each Tail. 2. 90% 0.05 1.645 1.96 2.575 95% D.025 99% 0.005 Print Done Enter your answer in the answer box and then click Check Answer
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