2. You are an epidemiology consultant to a large factory. You conduct a study of the occurrence of a particular respiratory disease among the workers, and find that the cumulative incidence of the disease among workers exposed to chemical A is 200 per 100,000, and the cumulative incidence of the disease among work- ers not exposed to chemical A is 20 per 100,000. Calculate the risk attributable to exposure to chemical A. (Adapted from Koepsell and Weiss. Epidemiologic Methods. p. 209.)

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