A test has a score reliability of .70.This means
A) if the test were administered again, at least .70 percent of the subjects would obtain the same score.
B) the test is 70 percent effective in measuring whatever it does measure.
C) 70 percent of the variance in the observed scores is free of error.
D) 70 percent of the variance in the observed scores is error variance.

Question

Quizplus · Accepted Answer

A test's score reliability of .70 indicates that 70 percent of the variance in the observed scores is due to true score variance (i.e., variance reflecting real differences in what is being measured), and thus is free of error. This means that 70% of the variability in test scores can be attributed to actual differences in the construct being measured, rather than to measurement error or other extraneous factors.

A Test Has a Score Reliability of