Question
A school psychologist wants to investigate student depression. She selects, at random, samples of 30 freshmen, 30 sophomores, 30 juniors, and 30 seniors to interview.
A school psychologist wants to investigate student depression. She selects, at random, samples of 30 freshmen, 30 sophomores, 30 juniors, and 30 seniors to interview. Which of the following best describes the principal's sampling plan?
A cluster sample
A convenience sample
A stratified random sample
A systematic sample
A simple random sample
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Algebra And Trigonometry Enhanced With Graphing Utilities (Subscription)
Authors: Michael Sullivan, Michael Sullivan III
8th Edition
0135813158, 9780135813157
