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The article by Krejcie and Morgan¹3 (Figure D5) is also a very handy way Daryle W. Morgan Educational and Psychological Measurement, 1970, Vol. Chapter Two: Research Methodology. 41. Table 2.3: Characteristics of sample size estimations. Authors. Characteristics. Krejcie and. Morgan. (1970). Download (v.krejcie & Morgan, 1970) download document. 9/29/2015Download Free PDF Krejcie and Morgan (1970) used the following formula to determine sampling size: S = X2NP (1-P)/ d2 (N-1) + X2P(1-P) S = required