Test Construction Reliability: True Score vs. Observed Score
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Questions and Answers

What type of error does the split-half reliability method address?

  • Inter-item inconsistency error
  • Scorer variance error
  • Sampling error
  • Content sampling error (correct)

    • What is the limitation of the reliability index gathered through split-half reliability?

  • It only measures the reliability of half the number of items in the test (correct)
  • It addresses inter-item inconsistencies
  • It is not a measure of reliability at all
  • It is a measure of scorer reliability

    • What is the formula for KR20?

  • rtt = 1 + rh / h
  • KR20 = rtt = 1 + rh / h (correct)
  • rtt = 1 + rh
  • KR20 = rtt = 1 - rh / h

    • What does the coefficient alpha measure?

    <p>Inter-item consistency</p> Signup and view all the answers

    What is the purpose of scorer reliability?

    <p>To minimize scorer variance in judgmental tests</p> Signup and view all the answers

    What type of tests are prone to scorer variance?

    <p>Projective tests and unstructured personality tests</p> Signup and view all the answers

    What is the formula for Coefficient Alpha?

    <p>r = (n / (n-1)) * (1 - (Σpq) / SD2t)</p> Signup and view all the answers

    What does the correlation in split-half reliability signify?

    <p>The consistency of responses to all items in the test</p> Signup and view all the answers

    Why is scorer reliability necessary in certain tests?

    <p>Because test scores rely on the judgment of the scorer</p> Signup and view all the answers

    What is the purpose of KR20?

    <p>To measure inter-item consistency</p> Signup and view all the answers

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