In a survey, 200 shoppers were asked whether they have access to a computer at home and if they have a personal e-mail account. Their responses aresummarized in the following table.No e-mailE-Mail accountaccountComputer access at home6218No computer access at home10110(a) What percentage of the shoppers have an e-mail account?(b) What percentage of the shoppers have computer access at home?(a) %(b) %

Answered: Image /qna-images/answer/38563c14-1ab2-44b5-8584-276817104ce2.jpg

Answered: In a survey, 200 shoppers were asked…

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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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 survey asked participants if they liked vanilla ice cream, chocolate ice cream, both, or neither. Of those surveyed, 44% liked vanilla, 68% liked chocolate, and 19% liked neither. What percentage of the students liked both vanilla and chocolate? (1) 17% (3) 27% (2) 22% (4) 31%
520 students from UC Berkeley are surveyed about whether they are from Northern California, Southern California, Central California, or from another state or country. A researcher is interested in seeing if the proportion of students from each of the four regions are all the same for all UC Berkeley students. The table below shows the outcome of the survey. Fill in the expected frequencies. Frequencies of UCB Students' Home Towns Outcome Frequency Expected Frequency Northern California Southern California Central California Out of State 189 152 170 1000
The table below reveals the relative frequencies of students and how they get to and from school. Why is the lower right cell in this table 100%? is it because every row in this sort of table adds to 100? all of the other numbers in the table add to 100? it was just a lucky set of numbers that happened to add to 100? or because 100% represents all of the students who were included in the data set?
just the last part, thank you!
A group of 175 college students who took math last term were interviewed. They were asked whether they passed their math course and whether they live on campus. Their responses are summarized in the following table. Passed math Failed math Live on campus 49 21 Live off campus 28 77 ? |(a) What percentage of the students passed math? 1% |(b) What percentage of the students live on campus? % |(c) What percentage of the students who live on campus passed math? [% |(d) Is there evidence that students who live on campus tend to pass math more often than average? O No, because the percentage found in part (c) is about the same as the percentage found in part (a). O No, because the percentage found in part (c) is about the same as the percentage found in part (b). O Yes, because the percentage found in part (c) is much greater than the percentage found in part (a). O Yes, because the percentage found in part (c) is much greater than the percentage found in part (b).
In 1942, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 440 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 418 indicated that they were total abstainers. Complete parts (a) and (b) below. (a) Determine the sample proportion for each sample. and respectively. The proportions of the adults who took the 1942 survey and the recent survey who were total abstainers are (Round to three decimal places as needed.)
A movie club surveyed 250 high school students. The students were asked how often they go to the movies and whether they prefer comedies or dramas. Their responses are summarized in the following table. Twice a monthor less Three times a monthor more Comedy 85 35 Drama 100 30 (a) What percentage of the students prefer dramas ? (b) What percentage of the students go to the movies twice a month or less?
A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than two percentage points question mark Complete parts (a) a) Assume that nothing is known about the percentage of computers with new operating systems.
A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 9595% confident that his estimate is in error by no more than fourfour percentage points question marks? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of computers with new operating systems. nequals=nothing (Round up to the nearest integer.) b) Assume that a recent survey suggests that about 9191% of computers use a new operating system. nequals=nothing (Round up to the nearest integer.) c) Does the additional survey information from part (b) have much of an effect on the sample size that is required? A. Yes, using the additional survey information from part (b) dramatically increases the sample size. B. No, using the additional survey information from part…

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