What is the correct sampling method for the question below?

Question

To determine the average salary of professors at Texas University, the faculty were divided into the following groups: instructors, assistant professors, associate professors, and professors. Twenty faculty members from each group were selected for the study. This represents what type of sampling method?

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a. cluster sampling

b. stratified sampling

c. systematic sampling

d. random sampling

e. none of these

Answer 1

cluster, because they are divided up into clusters or groups and then samples are taken from with those clusters.

Answer 2

systematic sampling!