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Changes Over Time: Comparing Scores in One Cohort with Scores of
Another Cohort - Percentile Rank of the Average Score, Sample Size Known
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Enter
the data for the more recent year
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a) Percentile of the average
score
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b) Number of students tested
for the more recent year
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Enter the data for the
comparison year
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a) Percentile of the average
score
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b) Number of students in the
comparison year
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Results
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Effect Size
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Improvement Index
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Probability
this effect would occur by chance
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