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Organizational Research: Determining Appropriate Sample ...

Information Technology, Learning, and Performance Journal, Vol. 19, No. 1, Spring 2001 43 Organizational research : Determining Organizational research : Determining Appropriate Sample Size in Survey ResearchAppropriate Sample Size in Survey research James E. Bartlett, IIJames E. Bartlett, II Joe W. KotrlikJoe W. Kotrlik Chadwick C. HigginsChadwick C. Higgins The determination of Sample size is a common task for many Organizational researchers. Inappropriate, inadequate, or excessive Sample sizes continue to influence the quality and accuracy of research . This manuscript describes the procedures for Determining Sample size for continuous and categorical variables using Cochran s (1977) formulas. A discussion and illustration of Sample size formulas, including the formula for adjusting the Sample size for smaller populations, is included.

Alpha Level. The alpha level used in determining sample size in most educational research studies is either .05 or .01 (Ary, Jacobs, & Razavieh, 1996). In Cochran’s formula, the alpha level is incorporated into the formula by utilizing the t-value for the alpha level selected (e.g., t-value for alpha level of .05 is 1.96 for

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