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Adair, John G.; Sharpe, Donald – 1986
The Hawthorne and placebo effects in educational experiments were examined over a 20-year period, as reported in the ERIC, Dissertation Abstracts International, and Psych Info data bases. The literature searches identified 325 studies in education employing the relevant control procedures, and each study was coded for the type of placebo…
Descriptors: Control Groups, Educational Research, Expectation, Literature Reviews
