Medical researchers followed 6272 Swedish men for 30 years to see if there was any association between the amount of fish in their diet and prostate cancer. (Source: "Fatty Fish Consumption and Risk of Prostate Cancer," Lancet, June 2001)

a) Is this a survey, a retrospective study, a prospective study, or an experiment? Explain
b) Is this a test f homogeneity or independence?
c) Do you see evidence of an association between the amount of fish in a man's diet and his risk of developing prostate cancer?
d) Does this study prove that eating fish does not prevent prostate cancer? Explain.

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Total Prostate Fish Consumption Subjects Cancers Never/Seldom Small Part of Diet2621 201 Moderate Part Large Part 124 14 2978 209 549 42