1. Lesson 12-3 Pages 617-621 Box-and-Whisker Plots 1.Display data in a box-and-whisker plot. 2.Interpret data in a box-and- whisker plot.

2. What you will learn! 1. How to display data in a box-and-whisker plot. 2. How to interpret data in a box-and-whisker plot.

3. Box-and-whisker plot

4. What you really need to know! A box-and-whisker plot divides a set of data into four parts using the median and quartiles. Each of these parts contain 25% of the data.

5. What you really need to know! Lower Extreme Lower Quartile Upper Extreme Upper Quartile Median

7. Example 1: The projected number of employees in 2008 in the fastest growing occupation is shown in the table below. Display the data in a box and whisker plot. Fastest-Growing Jobs Occupation Jobs (1000s) Occupation Computer Engineer 622 622 Desktop Publishing 44 44 Computer Support 869 869 Paralegal/Legal Assistant 220 220 Systems Analyst 1194 Home Health Aide 1179 Database Administrator 155 155 Medical Assistant 398 398

8. 4415522039862286911791194 Lower half of dataUpper half of data LQ is 187.5 Median between 398 and 622. 398 + 622 = 1,020 1,020 ÷ 2 = 510 UQ is 1,024

9. 02004006008001000120014001600 44 187.5 1,194 1,024 510

10. 2030405060708090100 Example 2: The box-and-whisker plot below shows the average percent of sunny days per year for selected cities in each state.

11. 2030405060708090100 Example 2: What is the smallest percent of sunny days in any state? 23%

12. 2030405060708090100 Example 2: Half of the selected cities have an average of sunny days under what percent? 56%

13. 2030405060708090100 Example 2: What does the length of the box in the plot tell us about the data? Since the box is short, the data is clustered together!

14. 0255075100 Example 3: Evergreen Trees Deciduous Trees The average maximum height, in feet, for selected evergreen and deciduous tress is displayed. How do the heights of evergreen tress compare with the heights of deciduous trees? Most evergreen trees are taller than most deciduous trees.

15. Page 619-620 Guided Practice #’s 4-9

18. Pages 617-619 with someone at home and study examples! Read:

19. Homework: Pages 620-621 #’s 10, 12, 14, 16, 17 #’s 22, 23, 26-29 Lesson Check 12-3

24. Page 753 Lesson 12-3