Chapter 1: Q 1.78 (page 25)
In simple random sampling, all samples of a given size are equally likely. Is that true in systematic random sampling? Explain your answer.
No. It is not true in the case of systematic random sampling.
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In Exercises 1.17-1.22, state whether the investigation in question is an observational study or a designed experiment. Justify your answer in each case.
Do Left-Handers Die Earlier? According to a study published in the Journal of the American Public Health Association, left-handed people do not die at an earlier age than right-handed people, contrary to the conclusion of a highly publicized report done 2 years earlier. The investigation involved a 6-year study of 3800 people in East Boston older than age 65. Researchers at Harvard University and the National Institute of Aging found that the "lefties" and "righties" died at exactly the same rate. "There was no difference, period," said Dr. J. Guralnik, an epidemiologist at the institute and one of the coauthors of the report.
British Backpacker Tourists.Research by G. Visser and C. Barker in " A Geography of British Backpacker Tourists in South Africa " (Geography, Vol . 89, No. 3, pp . 226-239) reflected on the impact of British backpacker tourists visiting South Africa. A sample of British backpackers was interviewed. The information obtained from the sample was used to construct the following table for the age distribution of all British backpackers. Classify this study as descriptive or inferential, and explain your answer.
Oklahoma State Officials. The five top Oklahoma state officials are displayed in Table 1.2 on page 11. Use that table to solve the following problems.
(a). List the 10 possible samples (without replacement) of size 3 that can be obtained from the population of five officials.
(b). If a simple random sampling procedure is used to obtain a sample of three officials, what are the chances that it is the first sample on your list in part (a)? the second sample? the tenth sample?
Identify some methods used in descriptive statistics.
Define each of the following terms in the context of experimental design.
(a) Response variable
(b) Factor
(c) Levels
(d) Treatments
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