26. The first step in selecting a sample should be to A) define the population B) decide how to stratify the population C) compile a list of the population D) determine how to randomize 27. Generalizing research findings from a sample to the population is most likely to be justifiable when: A) a small systematic sample is used B) cluster sampling is used in a large, heterogeneous population C) the null hypothesis is confirmed, regardless ofthe sampling procedures used D) a large random sample is used 28)A research worker plans to evaluate high school students' reactions to a new policy on closed campus stations. He locates himself near the office of the dean, where he interviews every fourth student who visits the dean. He eventually secures data from 100 interviews and publishes his findings as the "Reactions of high school students to a new policy for a closed campus." What may be with this approach? A) Too small a sample B) Inadequately defined problem C) Inadequate techniques of analysis D) Biased sample 29. The most important consideration in selecting a sample is that the sample be: A) selected from the population by means of a table of random numbers B) made up of a large number of subjects C) representative of the population selected from a large number of individuals or elements 0. The term "external validity" includes: A) population generalizability and ecological generalizability B) population generalizability and instrument validity C) internal validity and instrument validity D) internal validity and ecological generalizability