ERIC Number: ED226069
Record Type: RIE
Publication Date: 1983-Jan-27
Reference Count: 0
Comparison of Two Analysis Techniques for the Pre-Test/Post-Test Control Group Experimental Design.
Bennett, Richard P.
This study examines the relative effectiveness of two means of analyzing the pre-test/post-test control group experimental design. Samples were randomly drawn from a standardized normal population and assigned to one of the four cells of the design. A set of experimental differences were induced in the post-test experimental cell. Each case was subjected to a t-test of pre-test and post-test difference scores, and an analysis of covariance (ANCOVA) using the pre-test scores as the covariate. Analysis of 200 cases in each of four sample sizes indicated that: (1) the ANCOVA is a more sensitive test having greater power to detect the induced differences but also being more susceptible to a Type I error; and (2) the findings were essentially the same when cases involving heterogeneity of regression were included and when they were excluded. (Author)
Publication Type: Speeches/Meeting Papers; Reports - Research
Education Level: N/A
Authoring Institution: N/A
Identifiers: Homogeneity of Regression; T Test
Note: Paper presented at the Annual Meeting of the Southwest Educational Research Association (Houston, TX, January 27-29, 1983).