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Boxplot/Box-and-Whisker Plot
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A graphical distribution of the five number summary .The "box" in the middle contains the middle 50% of the values, and the "whiskers" extend out to the maximum and minimum values from the quartiles.
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First/Lower Quartile
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The number at which approximately 25% of the data set falls at or below that value.
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Five Number Summary
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A brief overview of a data set consisting of the minimum, the first quartile, the median, the third quartile, and the maximum.
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Quartiles
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The values that divide the data set into four equal partitions.
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Second Quartile/Middle Quartile/Median
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The number at which approximately 50% of the data set falls at or below that value.
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Third/Upper Quartile
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The number at which approximately 75% of the data set falls at or below that value.