A researcher designs a study so that everything is exactly the same except for the difference in dosage in a medication between two groups. This researcher is primarily concerned with
A) internal validity.
B) external validity.
C) the control group.
D) the experimental group.

Question

Quizplus · Accepted Answer

The researcher is concerned with internal validity, which refers to how well an experiment is done, especially whether it avoids confounding (i.e., ensures that the change in the dependent variable is due to the independent variable). By keeping everything the same except the dosage, the researcher aims to ensure that any differences observed are attributable to the medication dosage, thus enhancing the study's internal validity.

A Researcher Designs a Study So That Everything Is Exactly