Intro Stats, Books a la Carte Edition (5th Edition)

5th Edition

ISBN: 9780134210285

Author: Richard D. De Veaux, Paul Velleman, David E. Bock

Publisher: PEARSON

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative p…

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Textbook Question

Chapter 10, Problem 11E

Student samples The university administration of Exercise 1 is considering a variety of ways to sample students for a survey. For each of these proposed survey designs, identify the problem.

a) Publish an advertisement inviting students to visit a website and answer questions.
b) Set up a table in the student union and ask students to stop and answer a survey.

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Chapter 10, Problem 10E

Chapter 10, Problem 12E

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Administrators at Texas A&M University were interested in estimating the percentage of students who are the first in their family to go to college. The A&M student body has about 52,000 members. The A&M administration is considering a variety of ways to sample students for a survey. For each of these proposed survey designs, identify the problem. 60min a) Publish an advertisement inviting students to visit a website and answer questions. O A. This would be a convenience sample. O B. This would suffer from voluntary response bias. 60min OC. This would suffer from undercoverage. O D. This would suffer from nonresponse bias. b) Set up a table in the student union and ask students to stop and answer a survey. O A. This would be a convenience sample. O B. This would suffer from undercoverage. O C. This would suffer from voluntary response bias. O D. This would suffer from nonresponse bias.

Espa Kala has two ways to travel from her home in Norco to her office in Los Angeles. One is to go via the 10 Freeway, and the other is to go via 60 Freeway. In order to determine which way she should travel on a daily basis, Kala has recorded the travel times for samples of fourteen trips via the 10 Freeway and fourteen trips via the 60 Freeway. The following table gives the travel times (in minutes) for the twenty-eight trips. Travel times in minutes 10 Freeway 67, 71, 69, 67, 74, 73, 70, 76, 74, 74, 69, 75, 67, 73 60 Freeway 75, 69, 69, 78, 75, 75, 71, 79, 81, 76, 77, 70, 74, 74 Send data to calculator Send data to Excel Assume that the two populations of travel times are normally distributed and that the population variances are equal. Can we conclude, at the 0.01 level of significance, that the mean vel time via the 10 freeway, is different from µ,, the mean travel time via the 60 freeway? Perform a two-tailed test. Then complete the parts below. Carry your intermediate…

solve for the image below. c) Does the additional survey information from part (b) have much of an effect on the sample size that isrequired?

Chapter 10 Solutions

Intro Stats, Books a la Carte Edition (5th Edition)

Ch. 10.2 - Various claims are often made for surveys. Why is...Ch. 10.4 - We need to survey a random sample of the 300...Ch. 10 - Texas AM Administrators at Texas AM University...Ch. 10 - Satisfied workers The managers of a large company...Ch. 10 - AM again The president of the university plans a...Ch. 10 - Satisfied respondents The companys annual report...Ch. 10 - Sampling students A professor teaching a large...Ch. 10 - Sampling satisfaction A company hoping to assess...Ch. 10 - Sampling AM students For each scenario, identify...Ch. 10 - Satisfactory satisfaction samples For each...

Ch. 10 - Survey students What problems do you see with...Ch. 10 - Happy employees The company plans to have the head...Ch. 10 - Student samples The university administration of...Ch. 10 - Surveying employees The company of Exercise 2 is...Ch. 10 - Roper Through their Roper Reports Worldwide, GfK...Ch. 10 - Student center survey For their class project, a...Ch. 10 - Drug tests Major League Baseball tests players to...Ch. 10 - Gallup At its website (www.gallup.com), the Gallup...Ch. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - Prob. 20E Ch. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - In Exercises 17 to 23, for the reports about...Ch. 10 - Mistaken poll A local TV station conducted a...Ch. 10 - Another mistaken poll Prior to the mayoral...Ch. 10 - Parent opinion, part 1 In a large city school...Ch. 10 - Parent opinion, part 2 Lets revisit the school...Ch. 10 - Prob. 28E Ch. 10 - Prob. 29E Ch. 10 - Roller coasters An amusement park has opened a new...Ch. 10 - Playground, act two The survey described in...Ch. 10 - Wording the survey Two members of the PTA...Ch. 10 - Banning ephedra An online poll on a website asked:...Ch. 10 - Survey questions Examine each of the following...Ch. 10 - More survey questions Examine each of the...Ch. 10 - Phone surveys Any time we conduct a survey, we...Ch. 10 - Cell phone survey What about drawing a random...Ch. 10 - Fuel economy Occasionally, when I fill my car with...Ch. 10 - Prob. 40E Ch. 10 - Prob. 41E Ch. 10 - Quality control Sammys Salsa, a small local...Ch. 10 - A fish story Concerned about reports of discolored...Ch. 10 - Prob. 44E Ch. 10 - Prob. 45E Ch. 10 - More sampling methods Consider each of these...

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Solution Summary: The author explains that the university administrator publishes an advertisement inviting the students to visit a website and answer the questions.

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Chapter 10 Solutions