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Cards In This Set
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Reliability
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Dependable, repeatable results
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Methods for Estimating a tests Reliability
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1. Test-Retest Method
2. Parallel/Alternate Forms Method
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Explain Test-Retest Method
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A. Evaluates temporal stability
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Advantages & Disadvantages of Test-Retest Method
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C. Advantage
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Explain Parallel/Alternate Forms Method
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A. Similar to test/re-test, but form of test changes to an alternate form but still measures the same stuff in content.
b. Compare Correlation between test A & B.
c. High Correlation = Related
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Define Internal Consistency
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Extent to which items are interrelated in the cumulative. Do items
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Tests for measuring internal consistency
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1. Split-Half Reliability
2. Coefficient Alpha (Cronbach) α or jesus fish
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How to do split half reliability
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A. Divide test if half and score both parts, do they correlate.
b. Odd/Even Method
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Advantages & Disadvantages of Split-Half Reliability
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C. Advantages
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Define Coefficient Alpha (Cronbach) α or
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A. Better measure than split half.
b. Measures internal reliability
c. Has all advantages as split half
d. Depends on
i. Average intercorrelation of items should be high, higher average intercorrelation = higher α
ii. Number of items 0
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Errors of Measurement
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Unwanted variability
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Classical Test Theory (True Score Theory)
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Observed Score
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Standard Error of Measurement (SEM)
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SEM is standard deviation of observed scores
Exresses the expected error or margin of error
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SEM to get 95% score
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To get 95% score calc SEM * 1.96 & calc range
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Item Reliability Defined
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Used to build reliabilty into the test
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