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Changes Over Time: Comparing Scores in One Cohort with Scores of
Another Cohort - Percent at Benchmark, Sample Size Known
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Data
for the more recent year
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a) Percentage of students at
benchmark
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b) Number of students
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Data for the comparison year
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a) Percentage of students at
benchmark
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d) Number of students
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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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