Box Plots EQ: How do you analyze box plots?

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Presentation transcript:

Box Plots EQ: How do you analyze box plots?

Box-Plot 5 Number Summary 1.Median- Middle value 2. Minimum 3. Maximum 4. Lower Quartile (Q1) – Median of lower half 5. Upper Quartile (Q3) – Median of upper half

Analyzing a Box-and-Whisker Plot _____% 25% 25% 25% 25% 50% 50%

4, 4, 5, 6, 8, 8, 8, 9, 9, 9, 10, 12 Example 1: Draw a Box plot for the data below Drawing a Box Plot. Lower Quartile = 5½ Q1 Upper Quartile = 9 Q3 Median = 8 Q2 4 5 6 7 8 9 10 11 12

How to find the: Inter-Quartile Range Inter-Quartile Range – the difference between the upper and lower quartile of a set of data. Inter-Quartile Range = Upper Quartile – Lower Quartile Show where you could find the inter-quartile range on the box-and-whisker plot below: INTER-QUARTILE RANGE

Question: Stuart recorded the heights in cm of boys in his class as shown below. Draw a box plot for this data. Drawing a Box Plot. 137, 148, 155, 158, 165, 166, 166, 171, 171, 173, 175, 180, 184, 186, 186 Upper Quartile = 180 Qu Lower Quartile = 158 QL Median = 171 Q2 130 140 150 160 170 180 190