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Chapter 1: Q 1.30. (page 15)
Provide a scenario of your own in which a sample is not representative.
A sample from a particular school's 12th standard students is not a representative sample for judging the performance of all the students of the 12th standard in a particular subject.
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Identify two methods for obtaining a simple random sample.
In Exercises 1.7-1.12, classify each of the studies as either descriptive or inferential. Explain your answers.
Professional Athlete Salaries. From the Statistical Abstract of the United States and the article "Average Salaries in the NBA, NFL, MLB and NHL" by J. Dorish, published on the Yahoo! Contributor Network, we obtained the following data on average professional athletes' salaries for the years 2005 and 2011.
Causes of Death. The National Center for Health Statistics published the following data on the leading causes of death in 2010 in National Vital Statistics Reports. Deaths are classified according to the tenth revision of the International Classification of Diseases.
Rates are per 100,000 population.
Number of Farms.The National Agricultural Statistics Service (NASS) conducts studies of the number of acres devoted to farms in each county of the United States. Suppose that we divide the United States into the four census regions (Northeast, North Central, South, and West), take a simple random sample of counties from each of the four regions, and combine all four simple random samples into one sample. What type of sampling design have we used? Explain your answer.
Best-Selling Albums. The Recording Industry Association of America provides data on the best-selling albums of all time. As of May 28, 2013, the top six best-selling albums of all time (U.S. sales only), are by the artists the Eagles (E), Michael Jackson (M), Pink Floyd (P), Led Zeppelin (L), AC/DC (A), and Billy Joel (B).
(a). List the 15 possible samples (without replacement) of two artists that can be selected from the six. For brevity, use the initial provided.
(b). Describe a procedure for taking a simple random sample of two artists from the six.
(c). If a simple random sampling procedure is used to obtain two artists, what are the chances of selecting P and A? M and E?
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