CLASS 11. INTELLIGENC E  Anything that exists, exists in some amount.  And all amounts can be measured.  Thorndike, 1955 Psychological Measurement.

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Presentation transcript:

CLASS 11

INTELLIGENC E

 Anything that exists, exists in some amount.  And all amounts can be measured.  Thorndike, 1955 Psychological Measurement

Qualities of a good test Reliability Validity Standardization

1. Reliability are scores consistent? Test-retest Internal consistency Inter rater consistency

Typical test-retest reliabilities: AFTER SIX MONTHS: Personality tests: Intelligence tests: Height with tape measure:.98

   2. Validity  Does it Measure what it’s  supposed to ? Content validity Predictive validity Construct validity 

Eg ‘good driver’ test What is the concept ? How to operationalize ?

3. Standardization -ensures fair comparisons -norms based on large samples

Susceptible to Faking? Personality tests Can fake-good or fake-bad Intelligence tests Can’t fake good

Other Response Biases Acquiescent responding Extreme responding Random responding

INTELLIGENCE How to conceptualize it? How to operationalize it?

 Conceptualizing intelligence  ( 3 approaches )  1. PSYCHOMETRICS - measuring the mind   Spearman   Factor g (general intelligence)  Factor s  Special talents (music, mechanical)

 1. Spearman’s g  1 underlying factor  2. Thurstone’s Primary Mental Abilities  7 distinct factors  3. Hierarchical models of intelligence

2. The cognitive approach Mental speed Component analysis

 Measuring brain speed  P100 delay   Correlates with IQ scores  r = -.16 

Comparing Operationalizations of Intelligence IQ tests P100 Size of head HOW TO DECIDE ?: TEST VALIDITY