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