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Comparing Scores in One Group with Those in a Larger Group -
Percentile Rank of Average Student, Sample Size Known
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Data
for Your Group
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a) Percentile rank of average
score
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b) Number of students
tested
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Data for the Larger Group
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a) Percentile rank of average
score
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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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