The ability of a test to measure what it sets out to measure is ________.

A) reliability
B) correlation coefficient
C) standard deviation
D) validity

Correlation Coefficient

A numerical measure that indicates the extent to which two variables fluctuate together, signifying the strength and direction of their relationship.

Standard Deviation

A statistical measure of the dispersion or variability within a set of data, indicating how spread out the numbers are from the mean.

Validity

The degree to which a tool, test, or study accurately measures or reflects what it is intended to measure.