1. In a recent study, the researchers want to find the information about the percentage ofadults who get their news online.a. In a Harris poll of 3026 adults, 38% said that they prefer to get their news online.Construct a 95% confidence interval estimate of the percentage of all adults whosay that they prefer to get their news online. Can we safely say that fewer than50% of adults prefer to get their news online?b. If we want to conduct another survey, how many adults must we survey in orderto be 90% confident that we are within four percentage points of the populationpercentage? Assume that we have no prior information about the populationproportion.

Given datan = 3026proportion of people who prefer to get their news online = 0.38

Answered: 1. In a recent study, the researchers…

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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6. In the past, 70% of a garage's business was with former patrons. Clarence Wade, the owner of the garage, samples 600 repair invoices and finds that for 432 of them, the patron was a repeat customer. a. Develop a 90% confidence interval for the proportion of all current business that is with repeat customers.
12. A newspaper article stated that the US Supreme Court received 812 letters from around the country on the subject of whether to ban cameras from the courtroom. Of these 812 letters, 806 expressed the opinion that cameras should be banned. A statistics student was going to use this sample information to estimate a 95% confidence interval for the true proportion of all American adults feel that cameras should be banned from the courtroom. What would you tell this student? a. This is a large enough sample to provide an accurate estimate of the American public's opinion on the issue. b. The necessary conditions for a confidence interval for the true proportion are not satisfied, so we should not calculate a confidence interval. c. With such a large number of people favoring the notion that cameras be banned, there is no need for formal statistical inference. d. Because the proportion of individuals in favor of the ban is larger than the confidence level, the confidence interval is not…
26. You are trying to figure out if there is interest in a new restaurant opening in town. You speak to 150 random people, and discover that 60 of them would visit the new restaurant. Find a 95% confidence interval for the proportion of people that would visit the new restaurant.
In a survey of 3116 adults aged 57 through 85 years, it was found that 86.2% of them used at least one prescription medication. Complete parts (a) through (c) below. a. How many of the 3116 subjects used at least one prescription medication? b. Construct a 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication. c. What do the results tell us about the proportion of college students who use at least one prescription medication? A. The results tell us that there is a 90% probability that the true proportion of college students who use at least one prescription medication is in the interval found in part (b). B. The results tell us that, with 90% confidence, the probability that a college student uses at least one prescription medication is in the interval found in part (b). C. The results tell us that, with 90% confidence, the true proportion of college students who use at…
2.) A survey of 200 college students revealed that 160 of them eat dessert daily. Construct a 95% confidence interval for the population proportion of college students who eat dessert daily. Can we claim that 75% eart dessert daily?
The Gallup Poll interviews 1600 people. Of these, 18% say that they jog regularly. The news report adds: "The poll has a 95% confidence level and a margin of error of 3%." You can safely conclude that ... 95% of the population jog regularly between 15% and 21% of the time. We are sure the proportion of adults that jog regularly is between 15% and 21%. We are 95% confident the true portion of people that regulary jog is between 15% a and 21%. d. There is a 95% probability that the true proportion of adults that jog regularly is between 15% and 21%.
1. You have recently had a debate with a friend about who uses smartphones the most. Your friend believes that men use smartphones more than women. After conducting a research study you find that out of 973 randomly sampled men, 379 use smartphones. Out of 1,304 randomly sampled women, 404 used smartphones. Based on a 95% confidence level, after hypothesis testing, what would you tell your friend? a. Which test will you use to test for this statistical analysis? b.State the null and alternative hypothesis: i.H0: ii.Ha c.What is the value of the test statistic?
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. %
1. A company surveyed its employees to determine what the new daily meal allotment dollar amount should be. Of the 159 employees, 94 responded. Pat’s supervisor asked what the recommended dollar amount should be. Pat could take the mean of the 94 responses or calculate a confidence interval about the mean using those 94 responses. Which action of the two (don’t go outside these choices) would give the supervisor a better idea of what the true mean is, and why?
In a survey of 3213 adults aged 57 through 85 years, it was found that 83.9% of them used at least one prescription medication. Complete parts (a) through (c) below. a. how many of the 3213 subjects used at least one prescription medication? b. construct a 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication. c. what do the results tell us about the proportion of college students who use at least one prescription medication?
Construct a 95% confidence interval for p1 - p2 for a survey that finds 30% of 240 males and 41% of 200 females are opposed to the death penalty. Group of answer choices a.(-0.200, -0.021) b.(-1.532, 1.342) c.(-1.324, 1.512) d.(-0.561, 0.651)
9. A researcher wants to construct a 99% confidence interval for the proportion of Americans who think that the U.S. invading Iraq was an effective step in combating world terrorism. She has no initial idea of what that proportion is. How large should her sample size be if she wants the margin of error to be at most two percent? Show or explain your thinking.

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