The table shows the results of a survey in which separate samples of 400 adults each from the East, South, Midwest, and West were asked if traffic congestion is a serious problem in their community. Complete parts (a) and (b).**Graph Explanation:**There is an illustration titled "Bad Traffic Congestion?" indicating the percentage of adults who say that traffic congestion is a serious problem in different regions:- East: 34%- South: 32%- Midwest: 26%- West: 57%(a) Construct a 95% confidence interval for the proportion of adults from the Midwest who say traffic congestion is a serious problem.The 95% confidence interval for the proportion of adults from the Midwest who say traffic congestion is a serious problem is ( [ ] , [ ] ). (Round to three decimal places as needed.)

Answered: The table shows the results of a survey…

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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9. A study of 420,082 cell phone users found that 140 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0243% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %
Gay marriage. In May 2012, a CNN/ORC Poll asked arandom sample of 1009 U.S. adults this question:Do you think marriages between gay and lesbian couplesshould or should not be recognized by the law as valid,with the same rights as traditional marriages?Of those polled, 54% said they favored marriage equality,the highest percentage to date.a) Create a 95% confidence interval for the percentageof all American adults who support marriageequality.b) Based on your confidence interval, can you conclude that a majority of U.S. adults support legally recog-nizing gay marriages? Explain. c) If pollsters wanted to follow up on this poll with an-other survey that could determine the level of support for gay marriage to within 2% with 98% confidence,how many people should they poll?
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Mental health. The General Social Survey asked the question: “For how many days during the past30 days was your mental health, which includes stress, depression, and problems with emotions, not good?”Based on responses from 1,151 US residents, the survey reported a 95% confidence interval of 3.40 to 4.24days in 2010.(a) Interpret this interval in context of the data.(b) What does “95% confident” mean? Explain in the context of the application.(c) Suppose the researchers think a 99% confidence level would be more appropriate for this interval. Willthis new interval be smaller or wider than the 95% confidence interval?(d) If a new survey were to be done with 500 Americans, do you think the standard error of the estimatebe larger, smaller, or about the same.
2. According to the website Rotten Tomatoes, 94% of people who watched the Netflix show Stranger Things liked it. Since UR students tend to be scientifically minded, we hypothesize that less than 94% of UR students like the show. Out of 219 surveyed UR students, 198 indicated they like Stranger Things. Use the built in prop.test() function to: a. Construct a 90% confidence interval for the proportion of UR students who like Stranger Things. b. Test at the a=0.10 significance level whether the proportion of students who like Stranger Things is LESS THAN 0.94. What conclusion do you reach?
1. What conclusions can you draw about the proportions of Satisfaction with Quality of Care from Nurses and Satisfaction with Quality of Care from Specialists from the chart? A. The confidence intervals overlap, so we can conclude that the proportions are significantly different. B. The confidence intervals do not overlap, so we can conclude that the proportions are significantly different. C. The confidence intervals do not overlap, so we cannot conclude that the proportions are significantly different. D. The confidence intervals overlap, so we cannot conclude that the proportions are significantly different. 2. What conclusions can you draw about the proportions of the Satisfaction with Quality of Care from Nurses and Satisfaction with Quality of Care from Practitioners from the chart? A. The confidence intervals do not overlap, so we cannot conclude that the proportions are significantly different. B. The confidence…
15. Pain after surgery: In a random sample of 50 patients undergoing a standard surgical procedure, 15 required medication for postoperative pain. In a random sample of 90 patients undergoing a new procedure, only 16 required pain medication. a. Construct a 95% confidence interval for the difference in the proportions of patients needing pain medication between the old and new procedures. b. A physician claims that the proportion of patients who need pain medication is the same for both procedures. Does the confidence interval contradict this claim? 16
answer part c
Subject: accounting
In a study by Sallie Mae and Gallup, 323 of the 569respondents said that they paid for their education by taking out student loans. Find a 95% confidence interval for the proportion of students who paid for their education by taking out student loans.

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