Probability-Proportional-To-Size Sampling Requires That a

Multiple Choice

Probability-proportional-to-size sampling requires that a

A) certain proportion of second stage units will be selected from each first stage unit.
B) fixed number of second stage units be selected from each first stage unit selected.
C) variable ratio of first stage units be selected.
D) variable proportion of first stage units be selected.
E) None of the above.