PSYC 3200 Lecture Notes - Lecture 3: Normal Distribution, Computerized Adaptive Testing, Psychological Testing
7 Apr 2016
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Raw score must be compared to normative sample, otherwise raw score is arbitrary. Raw score: immediate value produced by testing procedure. They acquire meaning in reference to appropriate normative sample. Norm referenced tests: scores derive meaning from comparison to others. The normal curve: 1sd= 68. 26%, 2sd= 95. 44%, 3sd=99. 72% T-scores= mean 50, sd 10 (range from 20-80) Difficult to understand scores at either end of normal curve because there are less scores at each end to compare these outliers to, and regression to the mean. Selecting a norm group: age, gender, race, education, location (urban/rural, geographic region) Norm-referenced tests classify examinees from low-high, use representative sample of individuals, items chosen so they provide maximal discrimination. With this test, you can see if you did better or worse than others. Criterion-referenced tests used to compare accomplishments to performance standard, content selected on basis of its relevance in the curriculum. Reliability is a measure of consistency in certain aspects of measurement.
