When a researcher conducts an experiment and is fairly certain that changes in the independent variable caused changes in the dependent variable, that experiment is said to be high in ____.

A) construct validity
B) construct validity of the effect
C) internal validity
D) external validity

Internal Validity

The extent to which a study can rule out or make unlikely alternative explanations of the results, indicating that the causal relationship being tested is trustworthy.

Construct Validity

The degree to which a test or instrument accurately measures the theoretical construct it is intended to measure.