Descriptor
| Control Groups | 1 |
| Power (Statistics) | 1 |
| Research Design | 1 |
| Sampling | 1 |
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| Algina, James | 1 |
| Nthangeni, Mbulaheni | 1 |
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| Reports - Evaluative | 1 |
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Peer reviewedNthangeni, Mbulaheni; Algina, James – Educational and Psychological Measurement, 2001
Examined Type I error rates and power for four tests for treatment control studies in which a larger treatment mean may be accompanied by a larger treatment variance and examined these aspects of the independent samples "t" test and the Welch test. Evaluated each test and suggested conditions for the use of each approach. (SLD)
Descriptors: Control Groups, Power (Statistics), Research Design, Sampling
