Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)
Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)
7th Edition
ISBN: 9781337298353
Author: David R. Anderson, Dennis J. Sweeney, Thomas A. Williams
Publisher: South-Western College Pub
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Chapter 1, Problem 23SE

Pew Research Center is a nonpartisan polling organization that provides information about issues, attitudes, and trends shaping America. In a poll, Pew researchers found that 73% of teens aged 13-17 have a smartphone, 15% have a basic phone and 12% have phone. The study also asked the respondents how they communicated with their closest friend. Of those with a smartphone, 58% responded texting, 17% social media and phone calls. Of those with no smartphone, 25% responded texting, 29% social media and 21 % phone calls. (Pew Research Center website, October 2015).
a. One statistic (58%) concerned the use of texting to contact his/her closest friend, if the teen owns a smartphone. To what population is that applicable?
b. Another statistic (25%) concerned the use of texting by those who do not own a smart-phone. To what population is that applicable?
c. Do you think the Pew researchers conducted a census or a sample survey to obtain their results? Why?

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Pew Research Center is a nonpartisan polling organization that provides information about issues, attitudes, and trends shaping America. In a poll, Pew researchers found that 73% of teens aged 13–17 have a smartphone, 15% have a basic phone and 12% have no phone. The study also asked the respondents how they communicated with their closest friend. Of those with a smartphone, 58% responded texting, 17% social media and 10% phone calls. Of those with no smartphone, 25% responded texting, 29% social media and 21% phone calls.† Do you think the Pew researchers conducted a census or a sample survey to obtain their results? Why? Pew Research conducted a sample survey. A census would not have provided realistic information on such a large population. Pew Research conducted a census. A sample survey would not have provided realistic information on such a large population.     Pew Research conducted a census. It would not have been practical to conduct a sample survey on such a large…
In a poll conducted March 17-21, 2005, by the Pew Research Center for the People and the Press, a simple random sample of 1505 American adults were asked whether they were in favor of tighter enforcement of government rules on TV content during hours when children are most likely to be watching. Of the 1505 adults, 1129 responded yes. 1. What proportion of those surveyed were in favor of tighter enforcement of government rules on TV content during hours when children are most likely to be watching? 2. Obtain a 95% confidence interval for the proportion of Americans who are in favor of tighter enforcement of government rules on TV content during hours when children are most likely to be watching. (Round the final answer to four decimal places). P(1-p) CI = ptz 3. Interpret the confidence interval. 4. What proportion of those surveyed were in favor of tighter enforcement of government rules on TV content during hours when children are most likely to be watching when we apply the…
A study was conducted to explore the prevalence and impact of sleep problems on various aspects of people's lives. Staff from a university in Melbourne, Australia were invited to complete a questionnaire containing questions about their sleep behaviour (e.g. hours slept per night), sleep problems (e.g. difficulty getting to sleep) and the impact that these problems have on aspects of their lives (work, driving, relationships). The sample consisted of 271 respondents (55% female, 45% male) ranging in age from 18 to 84 years (M=43.9yrs). A student researcher is interested in examining whether the participants in the study sleep for 8 hours a night, the recommended average for adults. 1. Proposed analysis and why you chose the analysis 2. Measurement type (i.e., nominal, ordinal, continuous) for variable(s) that will be used in the analysis 3. Null and alternative hypotheses (based on context of study) in symbols 4. Test assumptions and make a decision (please provide written evidence to…

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Essentials of Modern Business Statistics with Microsoft Office Excel (Book Only)

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