2. In each of the following situations, describe the sample as an SRS, a stratif

Question

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

Explanation / Answer

(a) This is an example of multistage sample because the population has been divided into 7 clusters. Then, 3 clusters have been chosen at random from these 7 clusters. Then a simple random sample of elements are selected from each of these 3 randomly chosen clusters.

(b) This is an example of SRS. This is because a random sample of 5 is chosen from the population and each of the population units have an equal chance of being selected in the sample.

(c) This is an example of a voluntary response sample because it depends on the people visiting the site whether they want to participate in the poll and, thus, be included in the sample.

(d) This is an example of a stratified random sample because the population have been divided into 2 strata - males and females. Random samples were then selected from each of these 2 strata.

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