2.3. Box-and-Whisker Plots http://www.ck12.org
The calculations for determining the outlier in this case are as follows:
Lower Quartile: 74
Upper Quartile: 85
Interquartile range(IQR): 85− 74 = 11
- 5 ∗IQR= 16. 5
Cut-off for outliers in left whisker: 74− 16. 5 = 57. 5
Notice that we did not even bother to test the calculation on the right whisker because it should be obvious from
a quick visual inspection that there are no points that are farther than even one box length away from the upper
quartile.
If you press[ZOOM], and use the left or right arrows, the calculator will trace the values of the five-number
summary, as well as the last point on the left whisker.
The Effects of Changing Units on Shape, Center, and Spread
In the previous lesson, we looked at data for the materials in a typical desktop computer.
TABLE2.28:
Material Kilograms
Plastics 6. 21
Lead 1. 71
Aluminum 3. 83
Iron 5. 54
Copper 2. 12
Tin 0. 27
Zinc 0. 60
Nickel 0. 23
Barium 0. 05
Other elements and chemicals 6. 44