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Intro to Psychological Testing (part II)

Intro to Psychological Testing (part II). Clinical Judgment. Do clinicians have special powers of intuition? Can clinicians predict behavior better than other people? Does experience improve clinicians’ judgments?. Factors That Limit Clinical Judgment. Lack of feedback on outcomes

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Intro to Psychological Testing (part II)

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  1. Intro to Psychological Testing (part II)

  2. Clinical Judgment • Do clinicians have special powers of intuition? • Can clinicians predict behavior better than other people? • Does experience improve clinicians’ judgments?

  3. Factors That Limit Clinical Judgment • Lack of feedback on outcomes • Inability to use feedback (hindsight bias) • Confirmation bias • Illusory correlations and missing cells • Weighting information inappropriately • Overconfidence

  4. Some Principles of Test Interpretation • Extreme scores tell you more than normal range scores • Do not over-interpret differences between scales • Test interpretations are only hypotheses, not facts • Look for patterns; don’t rely on single indicators • Don’t assume the test is wrong if it doesn’t match your intuition

  5. Descriptive Statistics • Measures of Central Tendency • Mode • Mean • Median • Measures of Variability • Standard deviation

  6. Normal Curve

  7. Score Transformations _ z = X – X SD New score = z*NewSD + NewMean T = 10z + 50 IQ = 15z + 100

  8. Correlation • Looks at the relationship between two things • Scatterplot • Correlation coefficient

  9. Restriction of Range

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