The internal validity of a study refers to:

A) the confidence one can have in inferring a causal relationship among the variables.
B) the extent to which the variables represent what they were intended to measure.
C) the statistical accuracy of the constructs of the study.
D) the degree of meaning that can be placed upon a set of test results of the study.

Internal Validity

The extent to which the results of a study are due to the manipulation of the independent variable and not other factors.

Causal Relationship

indicates a situation where one variable directly affects another variable, implying causation rather than just correlation.

Statistical Accuracy

The degree to which statistical estimates reflect the true value of the parameter being measured.