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Smoking and the Incidence of Duodenal Ulcers Number of Persons at Start of Study Number of...

  1. Smoking and the Incidence of Duodenal Ulcers

Number of Persons

at Start of Study

Number of Observed New

Cases of Duodenal Ulcers

Nonsmokers                          22,295

60

Past Smokers                        20,757

60

Current Smokers                    4,754

16

  1. Calculate the relative risks of being a past smoker and a current smoker, relative to never having smoked.
  2. It is sometimes said by smokers, “The damage has been done, so I might as well keep smoking.” Others believe that if they quit “right now” their risk will be decreased. Which view is supported by the relative risks you calculated above?
  3. In your judgment, what values for the relative risks would support the opposite view from the one you believe was supported in part b?
Math   Statistics-And-Probability   
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