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VALIDITY OF QUANTITATIVE RESEARCH

VALIDITY 1 VALIDITY OF QUANTITATIVE RESEARCH Recall the basic aim of science is to explain natural phenomena. Such explanations are called theories (Kerlinger, 1986, p. 8). Theories have varying degrees of truth. VALIDITY is the best approximation to the truth or falsity of propositions (Cook & Campbell, 1979). VALIDITY is at best approximate or tentative since one can never know what is true. At best, one can know what has not yet been ruled out as false (Cook & Campbell, 1979, p. 37). And, as we have seen in examining the logic of hypothesis testing, statistical power, and the VALIDITY of outcome measures, we don t really prove that something is false.

the treatment groups’ posttest mean would be contaminated by ... groups being different on many variables. Interaction of Any two of the above threats to internal validity may interact Selection, to restrict the validity of the design. ... (e.g., Analysis of Covariance [ANCOVA]) • matching subjects in the treatment and control groups on ...

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