The Beck Depression Inventory-II has a reliability coefficient (coefficient alpha) of .92. Using classical test theory, interpret the meaning of this reliability coefficient.
a. The amount of error variance to observed variance is 92%
b. The amount of true variance to observed variance is 92%
c. The instrument has good enough reliability
d. The instrument's validity coefficient would be .922 (or .92 squared)
Answer: b. The amount of true variance to observed variance is 92%
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