R3.25. Timing In August 2011, a Sodahead.com voluntary responsepoll asked site visitors, "Obama is on Vacation Again: DoesHe Have the Worst Timing Ever?" 56% of the 629 voteswere for "Yes." During the week of the poll, a 5.8 earthquakestruck near Washington, D.C., and Hurricane Irene made itsway up the East Coast. What types of bias may be present inthe results of the poll?

Bias is the error that occur while collecting data or solving the data through intentionally or…

Answered: R3.25. Timing In August 2011, a…

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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10. A supermarket conducted a survey of 1000 consumers. Their population was "adults who shop for groceries." Use specific examples to explain how the following biases could have had the following effects: a. How could sampling bias have made it seem like adults eat more bread than in reality? b. How could non-response bias have made it seem like adults eat less fruit than in reality? c. How could response bias have made it seem like adults eat more vegetables than in reality? d. How could measurement bias have made it seem like adults drink more coffee than in reality?
27. Seven percent of mutual fund investors rate corporate stocks “very safe," 58% rate them "somewhat safe," 24% rate them “not very safe," 4% rate them “not at all safe," and 7% are “not sure." A BusinessWeek/Harris poll asked 529 mutual fund investors how they would rate corporate bonds on safety. The responses are as follows. Safety Rating Frequency Very safe Somewhat safe 48 323 79 Not very safe Not at all safe 16 Not sure 63 Total 529 Do mutual fund investors' attitudes toward corporate bonds differ from their attitudes to- ward corporate stocks? Support your conclusion with a statistical test. Use a = .01.
In 2014, Scotland was considering independence from England, going so far as to take a referendum vote. One opinion poll taken at the time showed that 51% of Scots favored "independence." In another poll taken at that same time, only 34% favored being "separate" from England. The primary reason these results differed by so much is that a. samples will usually differ just by chance due to random sampling. b. the wording of questions has a big effect on poll results. c. more follow-up efforts reduced the nonresponse rate of the second poll. d. the sample sizes are different, so the margins of error are different.
4a. Suppose that 35% of senior citizens have a social media account. If we survey 150 senior citizens, what is the mea of the sampling distribution?
Readers of the magazine Popular Science (August 1990) were asked to phone in (on a 900 number) their responses to the following question: “Should the United States build more fossil-fuel generating plants or the new so-called safe nuclear generators to meet the energy crisis of the 90s?” Of the total call-ins, 86% chose the nuclear option. What do you think about the way the poll was conducted? What do you think about the way the question was worded? Do you think the results are a good estimate of the prevailing mood of the country?
a radio talk show host asked listeners to respond either yes or no to the question, is the candidate who spends the most on a campaign the most likely to win? fifteen people called in and nine said yes what is the implied population? what is the variable? can you detect any bias in the selection of the sample?
A survey asked students at a high-school football game whether a fund for extra-curricular activities should be used to buy new equipment for the football team or instruments for the school band. Classify the type of bias demonstrated in this scenario. Think about how the survey process could be changed to eliminate/reduce bias.
A coach is interested in how many slam dunks the average college freshman at his university can do. Ten volunteers from the senior class step forward. After observing their performance, the coach concluded that college seniors can do an average of 10 slam dunks in a row without missing. what is the sample? what is the population?
According to a report, 63.3% of murders are committed with a firearm. (a) If 100 murders are randomly selected, how many would we expect to be committed with a firearm? (b) Would it be unusual to observe 78 murders by firearm in a random sample of 100 murders? Why? ..... (a) We would expect to be committed with a firearm. (b) Choose the correct answer below. A. No, because 78 is greater than + 20. B. Yes, because 78 is between u - 20 and u + 20. C. Yes, because 78 is greater than u + 2o. D. No, because 78 is between 20 and + 20. E. No, because 78 is less than u - 20.
sixty-five percent of those surveyed reply No to a certain question. If 234 reply No, what is the sample size?
About 7% of the popular has a mutation. 100 people are randomly selected. What is the mean for the number of people with a mutation?
QuickVote. TalkBack Live, a production of CNN, conducted on-line surveys on various issues. One survey, called a QuickVote, of 680 people asked “Would you vote for a third-party candidate?” Of the 680 people surveyed, 608 (89.4%) responded “yes” and 72 (10.6%) responded “no.” Beneath the vote tally, the following statement regarding the sampling procedure was found: This QuickVote is not scientific and reflects the opinions of only those Internet users who have chosen to participate. The results cannot be assumed to represent the opinions of Internet users in general, nor the public as a whole. The QuickVote sponsor is not responsible for content, functionality or the opinions expressed therein. Discuss the preceding statement in light of what you have learned

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