Which of the Following Is TRUE

Multiple Choice

Which of the following is TRUE?

A) In cluster sampling,the parent population is broken into mutually exclusive and exhaustive subgroups and a simple random sample is selected from each subgroup.
B) Cluster samples are most statistically efficient when the clusters are internally homogeneous.
C) In order to yield high statistical efficiency,each cluster in a cluster sample should include as many diverse population values as possible.
D) One of the main advantages of cluster sampling over simple random sampling is its greater statistical efficiency for the same size sample.
E) Cluster samples are more costly than stratified samples for the same sample size.