ToestimatetheproportionoftrafficdeathsinCalifornialastyearthatwerealcoholrelated,de- termine thenecessarysamplesizefortheestimatetobeaccuratetowithin0.04withprobability 0.90. BasedonresultsofstudiesreportedbytheNationalHighwayTrafficSafetyAdministra- tion (www.nhtsa.gov), we expecttheproportiontobeabout0.30.

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ToestimatetheproportionoftrafficdeathsinCalifornialastyearthatwerealcoholrelated,de-

termine thenecessarysamplesizefortheestimatetobeaccuratetowithin0.04withprobability 0.90. BasedonresultsofstudiesreportedbytheNationalHighwayTrafficSafetyAdministra-

tion (www.nhtsa.gov), we expecttheproportiontobeabout0.30.

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