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Descriptive Statistics. Describing data. Quartile. In descriptive statistics, a quartile is any of the three values which divide the sorted data set into four equal parts, so that each part represents 1/4th of the sample or population.first quartile (designated Q1) = lower quartile cuts off lowest 25% of data (25th percentile )second quartile (designated Q2) = mediancuts data set in half (50th percentile )third quartile (designated Q3) = upper quartilecuts off highest 25% of data, or low1144

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