Please tell me why 1.5 and 3 were used to multiply the IQR when determining the inner and outer fences. How did they come about? Are they a constant figure?
Md Ariful Islam
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Dr. Md Rushad Rahman
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1.5 is always used to multiply the IQR to find the fences. This is because the definition of an outlier is any data point more than 1.5 IQRs below the first quartile or above the third quartile. And 3 is just 1.5 doubled.
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