Question

3.54 What kind of sample? In each of the following situations, identify the sample as an SRS, a stratified random sample, a multistage random sample, or a voluntary response sample. Explain your answers.

(a) There are seven sections of an introductory statistics course. A random sample of three sections is chosen, and then random samples of eight 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 five.

(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 methods.

Answer 1

a) this is a multistage sampling method : at first you have selected statistics course from 7 sections and then we selected a random sample of three sections from them and then from it section to have selected it students this process is called multistage sampling as we selected samples in number of stages.

b) this is a simple random sampling method simply selected random samples from random number table.

c) this is a voluntary sampling method because the people or ask to choose their favourite show by their own decisions.

d) this is stratified random sampling technique because there are two different groups males and females are sampled separately.