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Pane, John F.; Griffin, Beth Ann; McCaffrey, Daniel F.; Karam, Rita – RAND Corporation, 2014
This addendum to previously published results presents alternative analyses of data from large-scale effectiveness studies of Cognitive Tutor Algebra I in middle schools and high schools. These alternative analyses produce results that are substantively the same as previously reported. We find a significant positive effect of 0.21 standard…
Descriptors: Algebra, Statistical Significance, Pretests Posttests, Reader Response