The test manual reports a reliability coefficient (r) of .92, which means:

a. 92% of the variance in scores is attributed to error

b. 92% of the variance in scores is explained by real differences

c. nothing conclusively because it depends on the method used

d. nothing conclusively because it depends on the source of measurement error

In statistics, reliability refers to how consistent a measurement scale is overall. Measurement scales with high reliability scores would be able to produce similar results when tested with groups of samples similar to the initial testing conditions.  

Reliability scores are measured through reliability coefficient which spans from 0.0 to 1.0. What a reliability coefficient of 0.92 means is (B) 92% of the variance in scores is explained by real differences.

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