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Effect of Ability Grouping on Variability
Effect of Ability Grouping on Pupil Adjust
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10-90 percentile range 25 percentile 29 pupils 75 percentile points adjustment in ability Arithmetic Computation Arithmetic Reasoning assumption average class enrollment average number Burr cent of total coefficient of variation composite scores corresponding range Cumulative Frequency difference difficulty of adjustments difficulty per ability difficulty per subject grades having three group mean groups each showed groups in grades groups per grade homogeneous grouping indicated ity Groups less than 12 measure of variability medians ment multiple track plan National Education Association need of adjustment number of pupils Number of Units ogive curve Paragraph Meaning percentages plan of promotion present study pupils per ability pupils per subject pupils per unselected range of achievement reducing relative variability scores deviated less separate subjects standard deviation Stanford Achievement Test subject groups Table test scores three ability groups three groups total range total score units of difficulty unselected groups variability in achievement Word Meaning YZ group