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Chapter 1: Q 1.27. (page 15)
Explain why a census is often not the best way to obtain information about a population.
A Census of the entire population is time-consuming, costly, impractical, or sometimes impossible.
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The International 500. In Exercise 1.49 on page 16, you used simple random sampling to obtain a sample of 10 firms from Fortune Magazine's list of "The International 500."
(a) Use systematic random sampling to accomplish that same task.
(b) Which method is easier: simple random sampling or systematic random sampling?
(c) Does it seem reasonable to use systematic random sampling to obtain a representative sample? Explain your answer.
Thoughts on Evolution. In an article titled "Who has designs on your student's minds?" (Nature, Vol. 434, pp. 1062-1065), author G. Brumfiel postulated that support for Darwinism increases with level of education. The following table provides percentages of U.S. adults, by educational level, who believe that evolution is a scientific theory well supported by evidence.
(a) Do you think that this study is descriptive or inferential? Explain your answer.
(b) If, in fact, the study is inferential, identify the sample and population.
Litigation Surveys. In the article, "Non - probability Sampling Designs for Litigation Surveys (Trademark Reporter, Vol. 81, pp. 169-179), J. Jacoby and H. Handlin discussed the controversy about whether nonprobability samples are acceptable as evidence in litigation. The authors randomly selected 26 journals from a list of 1285 scholarly journals in the social and behavioral sciences. They examined all articles published during one year in each of the 26 journals selected with regard to sampling methods. What type of sampling design was used by these two authors in their investigation? 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?
In sampling from a population, state which type of sampling design corresponds to each of the following experimental designs:
(a) Completely randomized design
(b) Randomized block design
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