What design? Analyze the design of each researchexample reported. Is it a sample survey, an observational study, or an experiment? If a sample, what are the popula-tion, the parameter of interest, and the sampling procedure? If an observational study, was it retrospective or prospective? If an experiment, describe the factors, treatments, randomi-zation, response variable, and any blocking, matching, or blinding that may be present. In each, what kind of conclu-sions can be reached? Some doctors have expressed concern that men who have vasectomies seemed more likely to develop prostate can-cer. Medical researchers used a national cancer registry to identify 923 men who had had prostate cancer and 1224men of similar ages who had not. Roughly one quarter ofthe men in each group had undergone a vasectomy, many more than 25 years before the study. The study’s authorsconcluded that there is strong evidence that having the operation presents no long-term risk for developing pros-tate cancer. (Source: Science News, July 20, 2002)

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Author:Amos Gilat
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What design? Analyze the design of each research
example reported. Is it a sample survey, an observational
study, or an experiment? If a sample, what are the popula-
tion, the parameter of interest, and the sampling procedure?
If an observational study, was it retrospective or prospective?
If an experiment, describe the factors, treatments, randomi-
zation, response variable, and any blocking, matching, or
blinding that may be present. In each, what kind of conclu-
sions can be reached?
Some doctors have expressed concern that men who have
vasectomies seemed more likely to develop prostate can-
cer. Medical researchers used a national cancer registry to
identify 923 men who had had prostate cancer and 1224
men of similar ages who had not. Roughly one quarter of
the men in each group had undergone a vasectomy, many
more than 25 years before the study. The study’s authors
concluded that there is strong evidence that having the
operation presents no long-term risk for developing pros-
tate cancer. (Source: Science News, July 20, 2002)
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