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A-Level

Statistical Sampling

Question

How do you decide whether a reading is an outlier?

2 years ago

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Vicky Abbott


1 Answer

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Theoretically, it is those data points which are 1.5 IQR below or above the lower or upper quartiles respectively. However, in practice , this is only a guide and it is imperative to understand the context of the data as data points outside this range could be not outliers and those in the range of so-called ‘not outliers’ could be outliers.

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