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,,Many investigators have studied the relationship between asbestos exposure and death from chronic obstructive pulmonary disease (COPD).,,5.10 Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10 year period from COPD, whereas only 24 such death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?