ViewHistoryBookmarksProfilesTabWindowHelpDo Homework- Chaptmathxl.com/Student/PlayerHomework.aspx?homeworkld360759039:MAT 135 RattrayHomework: Chapter...Question 2, 7.1.7Find the critical value z /2 that corresponds to the confidence level 96%.Za/2 =|(Round to two decimal places as needed.)%3D

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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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Heights for teenage boys and girls were calculated. The mean height for the sample of 51 boys was 183 cm and the variance was 66. For the sample of 71 girls, the mean was 173 cm and the variance was 61. There is no reason to assume the variances would be equal. Estimate how much taller teenage boys are using a 87% confidence level. Express this in the (point estimate) ± (margin of error) format. Round answers to 2 decimal places. H
What sample size is needed to give a margin of error within +3% in estimating a population proportion with 90% confidence? An initial small sample has p = 0.77. %3D Round your answer up to the nearest integer. Sample size =
A researcher surveyed 12 men who lost their fathers earlier in their lives. His survey included the age of the subjects when their fathers died and their confidence that they would someday be happily married themselves (100 point scale – higher score = more confidence). The results are shown below. Mx=15 My =60 SSx=348 SSy=5198 SPxy=933 Age Confidence Rating 12 34 8 30 11 89 21 69 15 55 7 38 18 78 23 66 22 89 19 79 9 35 15 58 Can you estimate a confidence rating for a man who lost his father at 30 years old? Why or why not?
We have presented a confidence interval (CI) for the difference, μ1 − μ2, between two population means. Interpret each confidence interval. 99% CI is from −10 to 5.
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 2 points with 99% confidence assuming s=13.4 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required?
Find the critical t value for a confidence level of 90% with a sample of size 17. Round your answer to 3 decimal places.
Report a 95% confidence interval for the slope coefficient. What is the left limit of the interval? Round to four decimals.
One year, the mean age of an inmate on death row was 38.1 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 36.9, with a standard deviation of 9.8. Construct a 95% confidence interval about the mean age. What does the interval imply? A Click the icon to view the table of critical t-values. Choose the correct hypotheses. Но (Type integers or decimals. Do not round.)
Find the level of the confidence interval that has the value Za/2 = 1.28. (Round the final answer to three decimal places.)
How many replicate measurements are necessary to decrease the 99% confidence limits for the analysis above by 50% of the confidence limits. Standard deviation is 0.0721, Mean is 2.43, there are 5 measurements and the z value is 2.58.
A poll was conducted that asked 1015 people how many books they had read in the past year. Results indicated that x= 14.3 books and s= 16.6 books. Construct a 90% confidence interval for the mean number of books people read. E Click the icon to view the table of areas under the t-distribution, Construct a 90% confidence interval for the mean number of books people read. ) (Use ascending order. Round to two decimal places as needed.)

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Find the critical value z/2 that corresponds to the confidence level 96%. Za/2 = (Round to two decimal places as needed.) %3D