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Comments on the method used by R. J. Herrnstein et al (see record 1987-08654-001) to evaluate an educational intervention that was designed to advance the thinking skills of 7th graders. It would seem preferable to adopt multiple linear regression techniques, rather than the t-test, as the chief analytic tool.



Schonfeld, I. S. (1987). Evaluation issues in a quasi-experiment on teaching thinking skills. American Psychologist, 19, 958-959. doi:org/10.1037/0003-066X.42.10.958



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