23. A large study evaluating a national mass media smoking cessation campaign in the United States recruited
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23. A large study evaluating a national mass media smoking cessation campaign in the United States recruited participants using a “. . . random-digit-dial method, from February 5 through April 15, 2008, prior to the national launch of the . . . media campaign” (Vallone et al., 2011, p. S39). Explain to a person who has never had a course in statistics
(a) why this method of sampling might be used and (b)
why it may be a problem if not everyone called agreed to be interviewed.
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