STAT 2040 Lecture Notes - Box Plot, Interquartile Range, Quartile

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Box and whisker plots box that and whisker you. For the length of 13 fish in a lake: example, graph is used to display can easily see where most of a the set of numbers data are. suppose you were to catch and measure. A box and whisker plot is based on medians. The first step is to rewrite the data in order, from smallest length to largest: Now find the median of all the numbers. Notice that since there are 13 numbers, the middle one will be the seventh number: This must be the median (middle number) because there are six numbers on each side. The next step is to find the lower median. This is the middle of the lower six numbers. The exact centre is half-way between 8 and 9 which would be 8. 5. This is the middle of the upper six numbers. The exact centre is half- way between 14 and 14 which must be 14.

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