Sampling: Design and Analysis, 2nd Edition Solution Manual

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Chapter 1Introduction1.1Target population: Unclear, but presumed to be readers ofParademagazine.Sampling frame: Persons who know about the telephone survey.Sampling unit = observation unit: One call. (Although it would also be correct toconsider the sampling unit to be a person. The survey is so badly done that it isdifficult to tell what the units are.)As noted in Section 1.3, samples that consist only of volunteers are suspect. This isespecially true of surveys in which respondents must pay to participate, as here—persons willing to pay 75 cents a call are likely to have strong opinions about thelegalization of marijuana, and it is impossible to say whether pro- or anti-legalizationadherents are more likely to call.This survey is utterly worthless for measuringpublic opinion because of its call-in format. Other potential biases, such as requiringa touch-tone telephone, or the sensitive subject matter or the ambiguity of thewording (what does “as legal as alcoholic beverages” mean?) probably make littledifference because the call-in structure destroys all credibility for the survey by itself.1.2Target population: All mutual funds.Sampling frame: Mutual funds listed in newspaper.Sampling unit = observation unit: One listing.As funds are listed alphabetically by company, there is no reason to believe therewill be any selection bias from the sampling frame. There may be undercoverage,however, if smaller or new funds are not listed in the newspaper.1.3Target population: Not specified, but a target population of interest would bepersons who have read the book.Sampling frame: Persons who visit the websiteSampling unit = observation unit: One review.1

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