Box and Whisker Plots Examples Page 1

Draw a box and whisker plot for the following data. Don't think outside of the box and whisker on this one.

1.2, 0.3, 0.4, 1.3, 0.7, 2.1, 0.5, 2.3, 1.3, 1.4, 2.4

The data are out of order, so the first thing we do is order the list:

0.3, 0.4, 0.5, 0.7, 1.2, 1.3, 1.3, 1.4, 2.1, 2.3, 2.4 .

The lowest value is 0.3, the highest value is 2.4, and the quartiles are

Q₁ = 0.5
Q₂ = 1.3
Q₃ = 2.1.

Since all the numbers we're using are decimals with one decimal place, we'll draw a scale with tenths marked out:

Next we find the lowest and highest values and the quartiles on the number line, and draw vertical lines above each:

We connect the lines above the quartiles with a box:

and finally draw the whiskers to the outermost lines. If we have time left over and want to make it look even prettier, we can pencil in some eyebrows.*