Box and Whisker Plots Examples Page 2

Draw a box and whisker plot for the following data:

-1, 2, 4, 4, 5, 5, 6, 6, 9, 14.

First we find the quartiles.

Q₁ = 4
Q₂ = 5
Q₃ = 6

The interquartile range is

IQR = 6 – 4 = 2.

To draw the fences, we use the distance

1.5(IQR) = 3.

We find the smallest and largest values inside (or on) the inner fences, in this case 2 and 9.