ERIC Number: ED092105
Record Type: Non-Journal
Publication Date: 1973-Apr
Reference Count: N/A
Verifying Sample Size Concerns. Research Report No. 737.
Bond, Jack H.
A study was made to ascertain how large a sample is needed to make media effectiveness decisions which are generalizable to the total educable mentally handicapped (EMH) population. The method employed in the study involved pretesting and posttesting a sample of 70 primary and intermediate EMH children on the content of a filmstrip. Statistical analyses of the data indicated that samples of five students gave results that were within the parameters of decision established by the Computer Based Project (Syracuse, N.Y.). When the sample size was increased to 10, the standard findings for increased sample size were supported, i.e., scores were within smaller ranges, variance between groups was reduced, and gains were more standardized. However, the investigators concluded that samples of five subjects seem to be large enough to establish estimates of population parameters within the limits of four out of five times. Larger samples do not add appreciable data or substantially change the outcome of decisions obtained from the samples of five. (Author/WCM)
Publication Type: Reports - Research
Education Level: N/A
Sponsor: Bureau of Education for the Handicapped (DHEW/OE), Washington, DC. Media Services and Captioned Films Branch.
Authoring Institution: Syracuse City School District, NY.