1. How do you determine which team played more consistently over the last six years?

2. In this lesson you will learn how to informally compare two populations by using the range and interquartile range.

3. Let’s Review Range : The difference between the greatest number and lowest number Range Range= 114 – 66=48

4. Let’s Review Interquartile Range (IQR): The range of the middle of the data. The difference between the upper quartile and lower quartile. IQR IQR = 94 – 76 = 18

5. Let’s Review A Common Mistake Finding the lower (Q1) and upper (Q3) quartiles 16 18 19 19 20 20 23 28 30

6. Let’s Review Core Lesson Measures of Variability Range, Interquartile Range, Median Absolute Deviation Range – influenced by outliers IQR – not influenced by outliers

7. Let’s Review Core Lesson Flamingos Cougars Number of Team Wins (6 seasons) Range = 51-31=20IQR = 47-31=16 Range = 42-36=6IQR = 42-39=3

8. Let’s Review Core Lesson NFC AFC Number of Team Penalties (NFL) Range = 138-60=78IQR = 113-68=45 Range = 114-66=48 IQR = 94-76=18

9. In this lesson you have learned how to informally compare two populations by using the range and interquartile range.

10. Let’s Review Guided Practice Compare the range and IQR of the medal count at the Summer Olympics for 1992 – 2008. USA Russia

11. Let’s Review Extension Activities Go to www.databaseOlympics.com, choose a range of years, and pick 2 countries. Find the medal count for the Winter Olympics for each of those countries. Use the range and IQR to compare the medal count for each country.

12. Let’s Review Extension Activities Measure the arm span and height of 7 classmates. Compare the two by using the range and IQR of each measurement.

13. Let’s Review Quick Quiz Compare the range and IQR to determine which week the fitness club exercised the least. Week 1 Week 2

14. Let’s Review Quick Quiz Use the range and IQR to determine who trained more for the marathon last week. Lucy Debra