Introduction to Statistics and Data Analysis
5th Edition
ISBN: 9781305115347
Author: Roxy Peck; Chris Olsen; Jay L. Devore
Publisher: Brooks Cole
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Chapter 2.2, Problem 24E
The 2013 National Study of Substance Use Habits of College Student-Athletes surveyed student athletes at NCAA member colleges and universities. The passage below is from the survey website (ncaa.org/about/resources/research/about-survey, retrieved February 13, 2018).
All NCAA member institutions are asked to participate. The sampling plan achieves an appropriate representation of all NCAA student-athletes while minimizing burden to institutions by asking that all student-athletes on no more than three teams be surveyed on any campus. The teams surveyed are determined by a computer-generated random draw.
The survey is administered to the selected teams in a classroom setting, and no identifying information about the athletes or the college is collected. The web site also states
It is important to note that even with measures to ensure anonymity, self-reported data of this kind can be problematic due to the sensitive nature of the issues. Therefore, absolute levels of use might be underestimated in a study such as this.
a. Was this sample a simple random sample, a stratified sample, a cluster sample, a systematic sample, or a convenience sample? Explain.
b. Give two reasons why an estimate of the proportion of students who reported using illegal drugs based on data from this survey should not be generalized to all U.S. college students.
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For unemployed persons in the United States, the average number of months of unemployment at the end of December 2009 was approximately seven months (Bureau of Labor Statistics, January 2010). Suppose the following data are for a particular region in upstate New York. The values in the first column show the number of
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Let x be a random variable indicating the number of months a person is unemployed.
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The input in the box below will not be graded, but may be reviewed and considered by your instructor.
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Chapter 2 Solutions
Introduction to Statistics and Data Analysis
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