2. Are attitudes toward shopping changing? Sample surveys show that fewer people enjoy shopping in storesthan in the past. A recent survey asked a random sample of 2500 U.S. adults if they agreed or disagreed withthe statement, "I prefer to shop for clothes online rather than in a store." In this survey, 1575 agreed. Amanager of a local clothing store claims that 60% of all U.S. adults would say "Agree" if asked the samequestion.(a) What is the sample proportion of U.S. adults who agreed with the statement?(b) If the manager's claim is true, what is the probability that the proportion in a random sample of 2500U.S. adults is at least as far above 0.60 as the results of this survey?(c) Based on your answer in part (b), do you have reason to doubt the manager's claim?

a) Suppose p is the population proportion of U.S. adults prefer to shop for clothes online rather…

Answered: Are attitudes toward shopping changing?…

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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Can an interviewer influence how people respond to the survey question, "Do you like dogs?" To answer this question, Jason carried out an experiment. As each person approached, Jason flipped a coin. If it landed on heads, Jason picked up his puppy and asked the person if they like dogs. If the coin landed on tails, Jason picked up a clipboard and asked the person if they like dogs. Of the 50 people that Jason surveyed while holding his puppy, 35 said "Yes," while 11 of the 44 people that Jason surveyed while holding his clipboard said "Yes." Let p₁ = the true proportion of people like the ones in this study who would say they like dogs when Jason is holding his puppy and p2 = the true proportion of people like the ones in this study who would say they like dogs when Jason is holding a clipboard. Construct and interpret a 90% confidence interval for the difference in the proportion of people like these who would say they like dogs when Jason is holding his puppy or a clipboard. O…
Ballistic Fingerprinting. In an on-line press release, ABCNews.com reported that “. . . 73 percent of Americans. . . favor a law that would require every gun sold in the United States to be test-fired first, so law enforcement would have its fingerprint in case it were ever used in a crime.” a. Do you think that the statement in the press release is inferential or descriptive? Can you be sure? b. Actually, ABCNews.com conducted a telephone survey of a random national sample of 1032 adults and determined that 73% of them favored a law that would require every gun sold in the United States to be test-fired first, so law enforcement would have its fingerprint in case it were ever used in a crime. How would you rephrase the statement in the press release to make clear that it is a descriptive statement? an inferential statement?
I am only given one attempt at this. I need help. A newspaper report conducted a survey of 753 people in New York City and found that 27% of the population believe that the Yankees will miss the playoffs this year. In the accompanying dialogue, the report states, we are 99% confident that the true proportion of people in New York City who believe that the Yankees will miss the playoffs this year lies between 23% and 31% . What does 4% represent in the report? A. a parameterB. a statisticC. a confidence intervalD. a margin of errorE. a confidence level
The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.
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Among college students, the proportion p who say they’re interested in their congressional district’s election results has traditionally been 65% . After a series of debates on campuses, a political scientist claims that the proportion of college students who say they’re interested in their district’s election results is more than 65% . A poll is commissioned, and 194 out of a random sample of 270 college students say they’re interested in their district’s election results. Is there enough evidence to support the political scientist's claim at the 0.05 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis H0 and the alternative hypothesis H1 . H0: H1: (b) Determine the type of test statistic to use. ▼(Choose one) (c) Find the value of the test statistic.…
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A recent drug survey showed an increase in the use of drugs and alcohol among local high school seniors as compared to the national percent. Suppose that a survey of 100 local seniors and 100 national seniors is conducted to see if the proportion of drug and alcohol use is higher locally than nationally. Locally, 67 seniors reported using drugs or alcohol within the past month, while 60 national seniors reported using them. Conduct a hypothesis test at the 5% level. a.State the distribution to use for the test. (Round your answers to four decimal places.) b.What is the test statistic? (If using the z distribution round your answer to two decimal places, and if using the t distribution round your answer to three decimal places.) c. What is the p-value? (Round your answer to four decimal places.)
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An executive for a large company is considering a change to health insurance plans offered to the employees. To assess employee satisfaction with the current plan, the executive sends an email to all company employees asking their opinion of the current plan. A summary of the results received shows that 27% of company employees are "highly satisfied" with the current health insurance plan. Which statement about the results is most likely to be true? O The results may suffer from undercoverage because the opinions of segments of employees may not be recorded, O The results provide an accurate representation of support because the opinion of all employees has been recorded. O The results may suffer from nonresponse bias because many satisfied employees may choose to not respond to the email survey. O The estimate of 27% for employee support of the health plan is likely accurate because all company employees were contacted via email. DellCommand Mark this and return Save and Exit Next…
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