Use the information to construct 90% and 99% confidence intervals for the population mean. Interpret the results andcompare the widths of the confidence intervals.Researchers surveyed a random sample of 32 U.S. workers ages 16 years and over who did not work from homeand asked how long (in minutes) it takes them to get from home to work. The responses are listed.32 51 35 47 25 24 25 40 17 47 21 34 27 39 32 17 Q70 18 11 52 29 55 31 71 39 29 16 43 31 26 59 87Construct the 90% and 99% confidence intervals for the population mean. Which interval is wider? If convenient,use technology to construct the confidence intervals.The 90% confidence interval is (). (Round to one decimal place as needed.)The 99% confidence interval is (). (Round to one decimal place as needed.)

The data shows the ages 16 years and over who did not work from home and asked how long it takes…

Answered: Use the information to construct 90%…

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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At one large college, 1867 out of the 2500 students surveyed said they plan to take another science class.Find the 95% confidence interval for the proportion of students that said they plan to take another science class. ? % to ? %
Person 1 Person 2 Person 3 Person 4 Person 5 Person 6 Person 7 Person 8 Person 9 Height (Inches) 68 66 65 63 63 68 66 64 66 Weight (lbs) 207 179 155 133 125 160 151 136 150 (CLO 1) Construct a confidence interval to estimate the mean height and the mean weight by completing the following: a. Find the sample mean and the sample standard deviation of the height. b. Construct and interpret a confidence interval to estimate the mean weight.
The number of times that a group of randomly selected students at a school, unlock their phones per day was recorded. These results are listed in the table below. 55 60 63 63 66 68 68 73 74 75 75 78 79 81 81 83 86 87 Round your answers to the nearest tenth of a phone unlock. A spreadsheet with the data can be copied from here.Links to an external site. 1) Use the information provided to construct a 95% confidence interval estimate of the average number of times that students unlock their phones each day. a) the margin of error, b) the critical number used, and c) the parameter being estimated (p or ). 2) Apple recently reported that the average iPhone user unlocks their phone 80 times per day. Does the evidence suggest, at this level of confidence, that the average number may be less for students at Cañada College? You must use the interval estimate in your answer. No yes or no answer.
How many subjects would be needed to ensure that a 95% confidence interval estimate of BMI had a margin of error not exceeding 2 units? 25 27 31 33 26 28 38 41 24 32 35 40
A survey was conducted where 27 students were asked which social media app is their favorite, Twitter or Tiktok. male female twitter 4 4 TikTok 4 15 create and interpret (in context) a one-proportion confidence interval. You may choose the level of confidence. conduct a Chi-Squared test for Association to determine if your data provide statistically significant evidence of an association between your two variables.
Assume that samples have been randomly selected from normally distributed populations.The table below shows the weights of 9 subjects before and after following a particular diet for two months. Subject A B C D E F G H I Before 169 180 157 133 202 124 190 210 181 After 162 178 145 125 181 126 182 195 163 Construct a 99% confidence interval for the mean difference of the "before" minus "after" weights. Interpret the results.
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You work for a consumer advocate agency and want to find the mean repair cost of a washing machine. As part of your study, you randomly select 29 repair costs and find the mean to be $100.00 and o is $17.50. a. Construct a 90% confidence interval. b. Construct a 95% confidence interval. c. Construct a 99% confidence interval.
. A study was conducted to measure the effectiveness of hypnotism in reducing pain. The meast on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a 95% confidence interval for the mean of the "before - after" differences. Does hypnotism appear to be effective in reducing pain? Before 4.3 1.5 8.3 7.8 12.3 8.8 6.6 7.5 After 6.1 2.3 7.2 8.1 8.2 6.9 3.3 2.6 Construct a 95% confidence interval for the mean of the "before - after" differences. > Prl > (Round to two decimal places as needed.) Does hypnotism appear to be effective in reducing pain? O A. Yes, because the confidence interval includes zero. O B. No, because the confidence interval does not include and is entirely greater than zero. O C. No, because the confidence interval includes zero. O D. Yes, because the confidence interval does not include and is entirely greater than zoro
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 480 college students showed that 23% of them had, or intended to, cheat on examinations. Find the 95% confidence interval for the population proportion. Round to four decimal places.
Online News In a Harris poll of 2036 adults, 40% said that they prefer to get their news online. Construct a 95% confidence interval estimate of the percentage of all adults who say that they prefer to get their news online. Can we safely say that fewer than 50% of adults prefer to get their news online?
Construct the indicated confidence interval for the difference in proportions. Assume that the samples are Independent and that they have been randomly selected. A survey of randomly chosen adults found that 45% of the 231 women and 61% of the 275 men follow regular exercise programs. Construct a 95% confidence interval for the difference in the proportions of women and men who have regular exercise programs. O A. (-0.165, -0.155) OB. (0.052, 0.268 ) OC. (-0.246, -0.074) O D. (-0.267, -0.053) O E. (-0.250, -0.070 )

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