Wynder and Grahams casecontrol study of smoking and lung cancer. A historically important casecontrol study of smoking

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Wynder and Graham’s case–control study of smoking and lung cancer. A historically important case–control study of smoking and lung cancer compared smoking histories of 605 lung cancer cases to 780 noncancer controls. Table 18.33 displays data from this study.

(a) Calculate the odds ratio associated with each level of smoking;

comment on the findings.

(b) Conduct a test for trend in the odds ratios.

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