Adria Used Stratified Sampling to Collect Data on Current Attitudes

Multiple Choice

Adria used stratified sampling to collect data on current attitudes toward American car manufacturers, while Benson used cluster sampling to survey people's attitudes. It turns out that the strata/clusters that both Adria and Benson drew their respondents from were quite heterogeneous. In this case, heterogeneous strata _____(a) _____ the precision of Adria's sample, and heterogeneous clusters _____(b) _____ the precision of Benson's sample.

A) increased; lessened
B) increased; increased
C) lessened; lessened
D) lessened; increased