Pearson eText Business Statistics: First Course -- Instant Access (Pearson+)
8th Edition
ISBN: 9780136880974
Author: David Levine, David Stephan
Publisher: PEARSON+
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A Pew Internet survey in 2012 examined several demographic variables of users of social networking sites including sex, age, race, education and income. Of the 1,802 users surveyed, 846 were men and 525 of them used social networking sites. Among the 956 women in the survey, 679 of them used social networking sites. Is there good evidence that the proportion of Internet users who use social networking sites is different for men and women.
Use the Plan, Solve and Conclude steps in answering this question.
More people are using social media to network, rather than phone calls or e-mails (US News & World Report, October 20, 2010). From an employment perspective, jobseekers are no longer calling up friends for help with job placement, as they can now get help online. In a recent survey of 150 jobseekers, 67 said they used LinkedIn to search for jobs. A similar survey of 140 jobseekers, conducted three years ago, had found that 58 jobseekers had used LinkedIn for their job search. (You may find it useful to reference the appropriate table: z table or t table)Let p1 represent the population proportion of recent jobseekers and p2 the population proportion of job seekers three years ago.
a. Set up the hypotheses to test whether there is sufficient evidence to suggest that more people are now using LinkedIn to search for jobs as compared to three years ago.
multiple choice 1
H0: p1 − p2 = 0; HA: p1 − p2 ≠ 0
H0: p1 − p2 ≤ 0; HA: p1 − p2 > 0
H0: p1 − p2 ≥ 0; HA: p1 − p2 < 0…
Organizations such as J.D. Power and Associates use the proportion of owners likely to repurchase a particular automobile as an indication of customer loyalty for the automobile. An automobile with a greater proportion of owners likely to repurchase is concluded to have greater customer loyalty.
A study was conducted to compare the customer loyalty for three automobiles: Chevrolet Impala, Ford Fusion, and Honda Accord. The study contained 500 respondents and the data is summarized in the Microsoft Excel Online file below. Use the spreadsheet to perform the required calculations and hypothesis test.
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