Box-And-Whisker Plots
By Virginia Vimpeny Lewis
What information do we need?
• Minimum data value
• Lower Quartile
• Median
• Upper Quartile
• Maximum data value
• Outlier values
What does it Look Like?
What are the parts?
Minimum Value
Lower Quartile
Median
Upper Quartile
Maximum Value
What if there are outliers?
2nd lowest value
Lower Quartile
Median
Upper Quartile
3rd highest value
OutlierOutlier
How to Identify the Range?
Minimum Value
Maximum Value
Range
The range is the distance between the Maximum and Minimum Values
How to Identify the Interquartile Range?
Interquartile Range
The interquartile range is the distance between the Upper and Lower Quartiles.
Lower Quartile Upper Quartile
How is the data divided?There are four sections of a box-and-whisker plot. Each section contains one-fourth or 25% of the data.
25% 25% 25% 25%
Now Try to Make Your Own!