The best way to select two groups for comparison in a causal-comparative research study so that they are highly different on the presumed causal variable is
A) through the use of matching.
B) by random selection of the groups from the defined population.
C) by determining the range of scores of the defined population on a measure of the variable and then selecting individuals whose scores are at the extreme of the range.
D) by using theory to determine the hypothetically extreme ranges of the presumed causal variable and then recruit volunteers who satisfy the requirements of the these ranges.

Question

Quizplus · Accepted Answer

Selecting individuals whose scores are at the extreme of the range ensures that the groups are highly different on the presumed causal variable, which is essential for comparison in causal-comparative research.

The Best Way to Select Two Groups for Comparison in a Causal-Comparative