A Professor Intends to Compare the Performances of His First

Multiple Choice

A professor intends to compare the performances of his first year economics subject students at the four campuses of the university. In order to do so, he selects a random sample of 40 first year economics students from each campus. What is this type of sampling called?

A) Stratified random sampling.
B) Simple random sampling.
C) Cluster sampling.
D) None of these choices are correct.