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 = 15.8 based on earlier studies?Suppose the doctor would be content with 90% 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.)A 90% confidence level requires subjects. (Round up to the nearest subject.)Partial Critical Value TableHow does the decrease in confidence affect the sample size required?Critical Value, za/2Level of Confidence,(1-a) • 100%O A. The sample size is the same for all levels of confidence.Area in Each Tail,2O B. Decreasing the confidence level decreases the sample size needed.90%0.051.645O C. Decreasing the confidence level increases the sample size needed.95%0.0251.9699%0.0052.575PrintDone

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 survey is conducted on 700 Californians older than 30 years of age. The study wants to obtain inference on the relationship between years of education and yearly income in dollars. The response variable is income in dollars and the explanatory variable is years of education. A simple linear regression model is fit, and the output from R is below: Im(formula = Income ~ Education, data = CA) Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 25200.25 1488.94 16.93 3.08e-10 *** Education 2905.35 112.61 25.80 1.49e-12 *** Residual standard error: 32400 on 698 degrees of freedom Multiple R-squared: 0.7602
A table summarizes the success and failures when subjects used different methods (yoga, acupuncture, and chiropractor) to relieve back pain. If we test the claim at a 5% level of significance that success is independent of the method used, technology provides a P-value of 0.0355. What does the P-value tell us about the claim?
Determine tc for n = 15 and a confidence level of 99%.
Suppose you survey a random sample from a large population to understand the population proportion. How large must your sample be if you want the Margin of Error to be 6% = 0.06 with a confidence level of 98%? (Be sure to show your calculations.) %3D
A histological test for cancer has sensitivity, specificity, positive predictivity, and negative predictivity in excess of 90 percent. Which of the four indicators would you use to reassure a patient that the positive result could be in error? Explain your answer.
If n=300 and x=60, construct a 99% confidence interval estimate for the population proportion.
If n = 220 and X = 176, construct a 95% confidence interval for the population proportion, p. Give your answers to two decimals
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 51.Find the critical value that corresponds to a confidence level of 95%.
In the population of senior students at Shermer High School, the proportion who plan to attend college is 0.64. In a random sample of 100 students from this population, the proportion who plan to attend college is 0.75. We would call the value 0.64 a P-value. z-score. parameter statistic significance level.
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 41.Find the critical value that corresponds to a confidence level of 98%.
One year, the mean age of an inmate on death row was 38.3 years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects 32 death-row inmates and finds that their mean age is 37.3, with a standard deviation of 8.7. Construct a 95% confidence interval about the mean age. What does the interval imply? E Click the icon to view the table of critical t-values. Choose the correct hypotheses. H, Hi: (Type integers or decimals. Do not round.) Construct a 95% confidence interval about the mean age. With 95% confidence, the mean age of a death row inmate is between places as needed.) What does the interval imply?
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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