The Wechsler tests employs a(n)
a. age scale concept.
b. criterion IQ concept.
c. self-reference point concept.
d. point scale concept.
Question 2
Difference scores are created by
a. subtracting one test score from another.
b. subtracting the true score from a predicted score.
c. eliminating error from true scores.
d. giving a test to two different individuals.