On occasion, a research objective is to perform subgroup analysis, which is an investigation of sub-segments within the population. The effort to gain knowledge about subgroups has direct implications for sample size. True False

Population refers to an entire group under study as specified by the objectives of the research project.

True

False

When a researcher uses convenience sampling, sample frame error occurs in the form of members of the population who are infrequent users or nonusers of that location.

True

False

There are two practical applications in which simple random sample designs are employed quite successfully: random digit dialing and computer-based random samples. However, the simple random sampling method does not guarantee that every member of the population has an equal chance of being selected into the sample; therefore, the resulting sample, no matter what the size, will not be a valid representation of the population.

True

False