Chapter 9 thought, language, and intelligence

Correlate highly with one another but not with

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Unformatted text preview: ical concept, or construct, based on a sample of relevant behavior - To construct a test, one needs to decide which specific behaviors serve best as indicators of intellectual abilities You need to take a sample Reliability - Refers to consistency of measurement - Assume that intelligence is a stable trait, and that test ­retest reliability in the same group of people should be similar on different occasions - Correlation of IQs 9 year olds and 40 year olds is in the .7 to .8 range showing a high degree of stability Relative to age, a person's intelligence does not change very much - The test itself must be internally consistent, meaning that all the items within a test is measuring the same thing - Interjudge reliability is when the same score should be given even if different psychologists grade the same test Scoring instructions must be explicit Validity - Validity refers to how well a test actually measures what it is designed to measure - Construct validity refers to whether a test is actually measuring what its trying to measure A test with perfect construct validity means that IQ differences truly measures differences in intelligence Psych 1000 My Notes Page 75 differences in intelligence - Content validity: does the test include all the aspects for the construct of interest Eg. An arithmetic test should include all the modes of operation and not just addition - Predictive validity is how highly scores correlate with criterion measures such as school and job performance IQ and school performance grades are in the +.60 range for high school students and +.30 to +.50 for university students SATs predict university performance with correlation of just below +.50 To a lesser degree, IQ predicts job performance with a +0.2 to +0.5 correlation StandardizationandNorms - Standardization has 2 elements 1. Tests must be administered in a well controlled environment to eliminate uncontrolled factors 2. A collection of norms (Test scores derived from a large sample) used to compare and interpret individual scores - When norms are collected...
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