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1. Supposeyouwanttoestimatethelevelsofdioxin(achemicalassociatedwithcancer)incommerciallycaughtwildsalmon.Whichofthefollowingsamplingapproacheswouldgiveyouanunbiasedestimateofthedioxinlevels?(Theremaybemorethanonecorrectanswer.Theremayalsobenocorrectanswer.) A. Fromaregistryofcommercialfishingboats,firstrandomlyselect10boatsandthentakesamplesfrom20randomlyselectedfishfromeachvessel.* B. Fromaregistryofcommercialfishingboats,firstrandomlyselect1boatandthentakesamplesfrom20randomlyselectedfishfromtheselectedvessel.* C.Takesamplesfrom100randomlyselectedsalmonfromthefirstcommercialfishingvesselthatreturnstotheBallarddocksattheendoftheseason. (*Assume the registry includes all fishing boats) 2. Supposeyouwantedtoestimatethelevelsofdioxinincommerciallycaughtwildsalmon.Betweensamplingapproaches A and Binquestion21wouldgiveyouthemostprecise(leastvariable)estimateofdioxinlevels, or will the two estimates be

1. Supposeyouwanttoestimatethelevelsofdioxin(achemicalassociatedwithcancer)incommerciallycaughtwildsalmon.Whichofthefollowingsamplingapproacheswouldgiveyouanunbiasedestimateofthedioxinlevels?(Theremaybemorethanonecorrectanswer.Theremayalsobenocorrectanswer.)

A. Fromaregistryofcommercialfishingboats,firstrandomlyselect10boatsandthentakesamplesfrom20randomlyselectedfishfromeachvessel.*

B. Fromaregistryofcommercialfishingboats,firstrandomlyselect1boatandthentakesamplesfrom20randomlyselectedfishfromtheselectedvessel.*

C.Takesamplesfrom100randomlyselectedsalmonfromthefirstcommercialfishingvesselthatreturnstotheBallarddocksattheendoftheseason.

(*Assume the registry includes all fishing boats)

2. Supposeyouwantedtoestimatethelevelsofdioxinincommerciallycaughtwildsalmon.Betweensamplingapproaches A and Binquestion21wouldgiveyouthemostprecise(leastvariable)estimateofdioxinlevels, or will the two estimates be equally precise?

3. Ifrandomlyselectedindividualsfromapopulationarecontactedandaskedtoparticipateinastudy,andifthosewhorefusearereplacedbyrandomlyselectedindividualswhoagreetoparticipate,shouldthefinalsamplebeconsideredarandomsubsetoftheoriginalpopulation?Explain.

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