Discussion
Which of the following is a method of estimating reliability coefficient of a test?
1. Parallel form
2. Split-half technique
3. Rational equivalence
Answer: D
All three are methods of estimating reliability. The parallel (alternate) form method correlates scores on two equivalent forms of the test. The split-half technique correlates two halves of one test. The rational equivalence method (the Kuder-Richardson approach) estimates reliability from the inter-correlation of the items. So the options listing fewer than all three are incomplete.
A fourth way is the test-retest method, in which the same test is given twice to the same people and the two scores are correlated.
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