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Download full textBeaton, Albert E.; Chromy, James R. – American Institutes for Research, 2007
Fundamental to statistical analyses is the comparison of means of one variable from two or more populations. Population samples may be constructed (i.e., experimental and control groups), or they may be natural groupings (i.e., students at a particular grade in different years). If the populations are similar, the mean comparisons are…
Descriptors: Control Groups, Academic Achievement, Statistical Analysis, Comparative Analysis
