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10 Cards in this Set
- Front
- Back
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Define Reliability
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Refers to consistency or stability of the measure
Must work exact same way each time it is used to be reliable |
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Define Method Error
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Error from the experimenter and testing situation or design
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What are errors in measurment?
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Method and Trait Errors
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Define Trait Error
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Error from the subject
examples...Giving wrong information (faking good or bad), forgetting events |
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What is an observed score?
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Observed score = true score + measurement error
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What is the formula for Reliability?
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True Score
__________ True score + error score No error...Reliability = 1 or -1 |
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What is a correlation coefficient?
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Value that indicates the strength of the relationships between two variables
ex) hours watching tv correlates with hours playing video games r score range from -1.00 to + 1.00 further from 0 = stronger correlation closer to 0 = weaker correlation |
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Define test/retest reliability
What are problems associated with test/retest |
Test people twice to see if their scores are stable
reliable test scores should be the same each time they are measure Practice effects - people get better at answering the questions the second time around, so the correlation gets weakended short interval - if the time between completing the measure is short, people might remember how they responded to the questions (tests their memory, not reliability of the measure |
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Define alternate forms reliability
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two different alternative froms tests
Tests are equivalent |
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Split-Half reliability
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Split items on a measure in half and correlate the two halves
total 50 items randomly split the scale in half (25 & 25) |
