If a Stratified Random Sample Is to Be Conducted, Which

Multiple Choice

If a stratified random sample is to be conducted, which of the following is true?

A) The population will be broken down into subgroups called strata.
B) Each subgroup should contain items that are homogeneous with respect to the characteristic of interest.
C) If effective, the total required sample size should be less than that which would be needed if a simple random sample were selected.
D) All of the above.