Stratifying a population prior to drawing a sample:
A)generally occurs when the variables used to stratify are known to be associated with the dependent variable.
B)eliminates the need for simple random sampling.
C)is most useful for studying a homogeneous population.
D)eliminates the need for probability sampling.
E)is an alternative systematic sampling.

Question

Quizplus · Accepted Answer

Stratifying a population prior to drawing a sample is generally done when the researcher knows that certain variables are associated with the dependent variable. By stratifying, the researcher can ensure that the sample includes proportional representation of participants with varying levels of the stratification variable. This increases the precision of the sample and can reduce sampling error. Eliminating simple random sampling or probability sampling is not the purpose of stratification. Stratification is also useful for studying populations that are diverse, not homogenous. Systematic sampling is a different sampling technique altogether.

Stratifying a Population Prior to Drawing a Sample