Why do neither matched samples nor matched pairs effectively eliminate the possibility of a third-variable correlation?
A)Each technique depends on the other;matched samples are studied first,followed later by matched pairs.
B)Both techniques allow us to rule out a particular third variable as a causal agent,but not the possibility of other third variables.
C)Both techniques fail to utilize random sampling.
D)By eliminating specific third variables,cause-and-effect relations are artificially established.

Question

Quizplus · Accepted Answer

Matched samples and matched pairs are both designed to control for a specific third variable by comparing groups that are similar in that variable. However, they do not control for all possible third variables that could be related to the outcome being studied. Therefore, there may still be alternative explanations for any observed differences between groups.

Why Do Neither Matched Samples nor Matched Pairs Effectively Eliminate