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These notes contain sub-sections on: - the range - the inter-quartile range - Population variance and standard deviation - Sample variance and standard departure - the alternative form of the sum of squares. Range is straightforward to calculate, but is highly sensitive to extreme values. Interquartile range measures the range of the middle 50% of the data. For a large data set, 25% of the data lie below the lower quartile. For small data sets, you use a procedure for placing the lower

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wolfretonmaths

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EN