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| National Norms | 1 |
| Norm Referenced Tests | 1 |
| Sampling | 1 |
| Standardized Tests | 1 |
| Statistical Bias | 1 |
| Test Norms | 1 |
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| Journal of Educational… | 1 |
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| Baglin, Roger F. | 1 |
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| Reports - Research | 1 |
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Peer reviewedBaglin, Roger F. – Journal of Educational Measurement, 1981
While major test publishers randomly select school districts for their national norming studies, a survey of "accepting" and "declining" districts supports the hypothesis that self-selection bias results in overrepresentation of districts which already use a specific publisher's tests or instructional materials. (Author/BW)
Descriptors: National Norms, Norm Referenced Tests, Sampling, Standardized Tests
