Q.

Which of the following techniques yields a simple random sample

A. choosing volunteers from an introductory psychology class to participate
B. listing the individuals by ethnic group and choosing a proportion from within each ethnic group at random
C. numbering all the elements of a sampling frame and then using a random number table to pick cases from the table
D. randomly selecting schools, and then sampling everyone within the school
Answer» C. numbering all the elements of a sampling frame and then using a random number table to pick cases from the table
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