ERIC Number: ED445080
Record Type: Non-Journal
Publication Date: 2000-Jan
Statistical Testing and Type I Error.
White, Amy E.
In traditional null hypothesis testing, researchers use critical values of various test statistics in order to minimize the risk of making Type I errors. These critical values are associated with common alpha levels (e.g., 0.01, 0.05) that indicate the probability of a Type I error. Alpha values are set at conservative levels such that the Type I error is at a minimum for any given test. However, as the number of statistical tests conducted on a single sample increases, the change of making a Type I error somewhere in the study escalates appreciably, becoming much larger than the alpha level associated with any single test. An educational research data set is used to illustrate this problem, and several corrections are suggested, including better specification of research questions, increased parsimony in selection of statistical tests, and use of multivariate methods when possible. (Contains 3 tables and 16 references.) (Author/SLD)
Publication Type: Reports - Evaluative; Speeches/Meeting Papers
Education Level: N/A
Authoring Institution: N/A