A stratified random sample reduces sampling error to the extent that variation within each stratum is __________; the sampling error of a cluster sample is reduced to the extent that variation within clusters is __________compared with the variation across clusters.
A) small; small
B) small; large
C) large; small
D) large; large

Question

Quizplus · Accepted Answer

In stratified sampling, reducing variation within each stratum minimizes sampling error. In cluster sampling, having large variation within clusters compared to across clusters helps in reducing sampling error.

A Stratified Random Sample Reduces Sampling Error to the Extent