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Comparing Changes Over Time in One Group with Changes Over Time
in A Larger Group - Means and Standard Deviations, Sample Size Known
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Enter
the data for your group
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a) Mean for the more recent
year
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b) Number of students tested
in the more recent year
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c) Mean for the comparison
year
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d) Number of students in the
comparison year
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Enter the data for the larger
comparison group
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a) Mean for the more recent
year
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b) Standard deviation for the
more recent year
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c) Mean for the comparison
year
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d) Standard deviation for 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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