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 *Q*_{1} = 0.5
*Q*_{2} = 1.3
*Q*_{3} = 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.* |