Business Statistics: A First Course (8th Edition)
8th Edition
ISBN: 9780135177785
Author: David M. Levine, Kathryn A. Szabat, David F. Stephan
Publisher: PEARSON
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According to a poll, 77% of California adults (389 out of 506 surveyed) feel that education is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education is one of the top issues facing California.What is a point estimate for the true population proportion?
Calculate and interpret a 95% confidence interval to estimate the true proportion of California adults who watch netflix
Define the confidence level?
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- You work for a consumer advocate agency and want to find the mean repair cost of a washing machine. As part of your study, you randomly select 29 repair costs and find the mean to be $100.00 and o is $17.50. a. Construct a 90% confidence interval. b. Construct a 95% confidence interval. c. Construct a 99% confidence interval.arrow_forwardPublic Policy Polling recently conducted a survey asking adults across the U.S. about music preferences. When asked, 80 of the 571 participants admitted that they have illegally downloaded music. Create a 99% confidence interval for the true proportion of American adults who have illegally downloaded music.arrow_forwardTo devise effective marketing strategies it is helpful to know the characteristics of your customers. A study compared the demographic characteristics of people who use the Internet for travel arrangements. Of 932 Internet users, 543 had completed college. (a) Find a 95% confidence interval for the proportion of people who use the Internet for travel arrangements, and have a college degree. (b) Can you conclude from this study that the majority of people who use the Internet for travel arrangements own a college degree? Justify your answer using the confidence interval computed in (a).arrow_forward
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