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The ________ sample involves dividing the population into groups, then randomly selecting some of the groups and taking either a sample or a census of their members.

/in /by

The ________ sample involves dividing the population into groups,

then randomly selecting some of the groups and taking either a sample or a census of their members.
A.     Cluster
B.     Random
C.     Simple
D.     Stratified

 
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