What kind of sample? In each of the following situations, describe the sample as an SRS, a stratified random sample, a multistage sample, or a voluntary response sample. Explain your answers.
(a) There are 7 sections of an introductory statistics course. A random sample of 3 sections is chosen, and then random samples of 8 students from each of these sections are chosen.
(b) A student organization has 55 members. A table of random numbers is used to select a sample of 5.
(c) An online poll asks people who visit this site to choose their favorite television show.
(d) Separate random samples of male and female first-year college students in an introductory psychology course are selected to receive a one-week alternative instructional method.