Sample Size Estimation using Yamane and Cochran and Krejcie and Morgan and Green Formulas and Cohen Statistical Power Analysis by G*Power and Comparisions

Abstract

Sample Size Determination of Quantitative Research; population size as research fields for researcher to collect data for analyzing Descriptive Statistics and Inferential Statistics therefore sample size refers as representative of the population. Research Purposes; To study sample size determination of academic officer for references, To determine sample size of the research appropriate for population size, and To calculate sample size by G*Power Derivation of the sample size of this research is Documentary Research by calculating from various formulas of academic officer such as Taro Yamane, Krejcie & Morgan, Cochran, Green, S. B. and Cohen, J. including calculation formulas, table, comparison and computer program of G*Power depending on variable types, variable measurement scales, Type I error (Alpha, ), Type II error (Beta, ), Power of Test:  and Effect Size.