What is the population? For each of the following sampling situations, identify

Question

What is the population? For each of the following sampling situations, identify the population as exactly as possible. That is, indicate what kind of cases the population consists of and exactly which cases fall in the population. If the information given is not sufficient, complete the description of the population in a reasonable way.

(a) Each week, the Gallup Poll questions a sample of about 1500 adult U.S. residents to determine national opinion on a wide variety of issues.

>>I think the population is all adult US residents.

(b) The 2000 census tried to gather basic information from every household in the United States. Also, a “long form” requesting additional information was sent to a sample of about 17% of households.

>>I think the population is all households in the US.

(c) A machinery manufacturer purchases voltage regulators from a supplier. There are reports that variation in the output voltage of the regulators is affecting the performance of the finished products. To assess the quality of the supplier’s production, the manufacturer sends a sample of five regulators from the last shipment to a laboratory for study.

>>I think the population is voltage regulators from a supplier.

I think I can figure out the population, but I do know the what does "what kind of cases the population consists of and exactly which cases fall in the population" mean.

Explanation / Answer

a. The population is all the US residents who have knowledge on a variety of issues

b. The population is all the US households

c. The population is the voltage regulators purchased from the supplier

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