Chapter 1: Q 1.57. (page 23)
Ideally, in stratified sampling, the members of each stratum should be relative to the characteristic under consideration.
Ideally, in stratified sampling, the members of each stratum should be homogenous to the characteristic under consideration.
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Explain why a census is often not the best way to obtain information about a population.
Incomes of College Students 'Parents. A researcher wants to estimate the average income of parents of college students. To accomplish that, he surveys a sample of 250 students at Yale. Is this a representative sample? Explain your answer.
Medical Testing on Animals. In its Summer 2013 Animal Action Report, the National Anti-Vivisection Society stated that "59% of Americans between the ages of 18 and 29 oppose medical testing on animals." The percentage of 59% was computed from sample data.
(a). Identify the population under consideration.
(b). Identify the sample under consideration.
(c). Is the statement in quotes descriptive or inferential?
(d). If you wanted to make it clear that the percentage of 59% was computed from sample data, how would you rephrase the statement in quotes?
Oklahoma State Officials. Refer to Table 5.1 on page 196.
(a). List the possible samples without replacement of size 4 that can be obtained from the population of five officials. (Hint: There are five possible samples.)
If a simple random sample without replacement of four officials is taken from the five officials, determine the probability that
(b). the governor, secretary of state, attorney general, and treasurer are obtained.
(c). the governor and treasurer are included in the sample.
(d). the governor is included in the sample.
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.
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