Test Worthiness. Chapter 3. Test Worthiness. Four cornerstones to test worthiness: Validity Reliability Practicality Cross-cultural Fairness But first, we must learn one statistical concept: Correlation Coefficient. Correlation Coefficient. Correlation –
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r = .35
r = -.67
How about this correlation?Scatterplots (cont)
AnxietyCoefficient of Determination (Shared Variance)
a. Coefficient Alpha
c. Split-half or Odd Even
person 1person 2person 3person 4person 5 others….
BAlternate, Parallel, or Equivalent Forms Reliability