ERIC Number: ED040578
Record Type: RIE
Publication Date: 1970-Feb
Reference Count: 0
An Experimental Research Design for Comparing the Retention Effects of Different Instructional Treatments. An Occasional Paper.
Cook, J. Marvin
The effects of instructional treatments are most often evaluated on the basis of an analysis of posttests given immediately following the completion of the instruction. In order to compare the relative effectiveness of different methods of instruction, it is also useful to know something about the retention effects of various instructional treatments. Interpretation of the effect different teaching methods have on retention must be based, not merely on performance on the delayed posttest, but on the relationship of the performances on the immediate and the delayed posttests. An example of research involving four instructional treatments and two repeated measures (posttests) with no pretests is discussed as an application of repeated measures analysis to the study of retention. The equations necessary for determining certain critical factors in the analysis are demonstrated. The location of significant differences, calculatio n of the slopes of retention curves, and tests for assumptions of homogeneity of variance are also illustrated. A reference list is appended. (JY)
Publication Type: N/A
Education Level: N/A
Sponsor: Office of Education (DHEW), Washington, DC. Bureau of Research.
Authoring Institution: Maryland Univ., Baltimore.