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 = 12.5 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 to view a partial table of critical values.A 99% confidence level requires subjects. (Round up to the nearest subject.)TutoringHelp me solve thisGet more help-Clear allCheck answerMacBook Pro**escG Search or type URL@#$%&78.delete1234QWERYP11GHJK

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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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A poll was conducted that asked 1017 people how many books they had read in the past year. Results indicated that x= 13.9 books ands= 16.6 books. Construct a 95% confidence interval for the mean number of books people read. Click the icon to view the table of areas under the t-distribution. Question Help v Construct a 95% confidence interval for the mean number of books people read. (Use ascending order. Round to two decimal plaçes as needed.) Enter your answer in the edit fields and then click Check Answer. All parts showing Clear All Check Answer P Type here to search 451 PM 4/11/2021 A= 4 de ENG DELL Pgup Delete PrtScr Insert F11 F12 F9 F10 F7 F8 F5 F6 F4 F3 40) Esc F1 F2 Backspace & %3D 24 % 6. 8. 7
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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=16.4 based on earlier studies? Suppose the doctor would be content with 90% confidence. How does the decrease in confidence affect the sample size required? LOADING... Click the icon to view a partial table of critical values. A 99% confidence level requires nothing subjects. (Round up to the nearest subject.) A 90% confidence level requires nothing subjects. (Round up to the nearest subject.) 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.
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 7.Find the critical value that corresponds to a confidence level of 99.9%.
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Find the critical t-value that corresponds to 70% confidence. Assume 7 degrees of freedom.
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You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8. While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 93.5%.
A researcher believes that low BMI levels are indicators of eating disorders. He collects BMI of a sample of young adults identified as at risk for eating disorfers to see if their mean BMI is significantly below 18.5 What test would you use and why? (z test, independent t test, single sample t test, paired samples)
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 = 14.7 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. subjects. (Round up to the nearest subject.) subjects. (Round up to the nearest subject.) A 99% confidence level requires A 95% confidence level requires How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level increases the sample size needed. B. The sample size is the same for all levels of confidence. OC. Decreasing the confidence level decreases the sample size needed. ...
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8.Find the critical value that corresponds to a confidence level of 99%.
According to a survey conducted by the Association for Dressing and Sauces, 85% of American adults eat salad at least once a week. A nutritionist suspect that the percentage is higher that this. She conducts a survey of 200 American adults an finds that 171 of them eat salad at least once a week. Conduct the appropriate test that addresses the nutritionist's suspicions. Use the a = 0.1 level of significance. What is the test statistic? t-score population parameter Z-Score standard deviation

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