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63 GLOSSARY On-board and intercept surveys--self-administered surveys Simple random samples--sample in which each person in distributed on board buses and rail cars and in stations, and the study population has an equal chance of being selected. personal interviews conducted in these environments. Stratified sample--sample divided into separate subsamples, Sample--group of people selected to be surveyed and that each of which is then sampled as a simple random sample. the researcher attempts to contact. Study population--population to which the researcher can Sample frame--listing of the study population from which gain access. the sample will be drawn. Theoretical population--population to which researchers Sampling error--difference between the true (but unknown) wish to generalize. value and observed values if, hypothetically, the survey were repeated numerous times.