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Maths II

Semi-interquartile range

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Semi-interquartile range

We know that the median divides a set of data into two halves.

We also know that for a set of n ordered numbers, the median is the

n plus 1, all to the power of t h, over 2.

Example

If there are 13 numbers, the median is (13 + 1)/2 = 7th number

Similarly, the lower quartile divides the bottom half of the data into two halves and the upper quartile divides the upper half of the data into two halves.

The lower quartile is the n plus 1, all to the power of t h, all over 4. value and the upper quartile is 3 times the following equation. N plus 1, all to the power of t h. This is all over 4.

A horizontal line with 3 markers on it, at quarter intervals. The first line says lower quartile, the middle line says median, anf the third line says upper quartile.

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