Which Step Is Not Involved with Constructing a Representative Sample

Multiple Choice

Which step is not involved with constructing a representative sample?

A) Choose the independent variables you want to match.
B) Collect the sample by randomly sampling from each stratum (defined by your pre-chosen independent variables) .
C) Use information about the population to stratify (categorize) each of the chosen variables.
D) Run a t-test to check if the outcomes are different across stratums.