1. Warm up
Find the
Mean
Median
Mode 0, 23, 12, 5, 8, 5, 13, 5, 15

2. 10.2 Measures of Variability

3. Goals Find measures of variability
Use measures of variability to interpret and analyze data

4. Vocabulary
Measures of Variability – describe the distribution of the data (Range, 1st Quartile, Median, 3rd Quartile)
Range – the difference between the greatest and least values of the set (Largest value – Smallest value)
Quartiles – the data is divided into 4 parts (“quarters”).
Median divides the data into half
First quartile divides the lower half into quarters
Third quartile divides the upper half into quarters

5. Vocab
Interquartile Range – The range of the two middle quarters (Q3 – Q1)
Outlier – values that are (1.5 times the interquartile range) beyond the quartiles
Find the interquartile range (Q3 – Q1)
Multiply by 1.5
Subtract this value from Q1, Add to Q3. Numbers beyond these values are outliers

6. Example 1 - Range

7. Example 2

8. Example 3 - Outliers

9. Example 4 – Using Measures of variability
Interquartile range is
Describe what happens in each quartile: First Quartile you burn calories or less Interquartile (half of the activities) you burn between 231 and Third Quartile you burn more than 231

10. Example 5

12. Page all