Question

A researcher randomly assigns one classroom to a new teaching method and a second classroom to the control condition (the regular teaching method). This researcher faces the potential problem of confounding due to:_______.1. Experimenter effect2. Selective subject loss3. Intact groups4. Extraneous variables

Answer 1

Answer:

3. Intact groups

Explanation:

In this design, intact groups are groups of individuals that are already formed, so the researcher has no guarantee of their initial equivalence. The problem is that if the initial equivalence of the groups is not guaranteed, it can be questioned that the differences between the groups after the intervention are due to the effect of the experiment.