STA220H1 Chapter Notes - Chapter 5: Box Plot, Quartile

• School: UTSG
• Department: Statistical Sciences
• Course: STA220H1
• Professor: Augustin Vukov

Document Summary

Boxplots and 5-number summaries: once we have a 5-number summary of a (quantitative) variable, we can display that information in a boxplot: draw a single vertical axis spanning the extent of the data. Draw short horizontal lines that are lower and upper quartiles and at the medium, then connect them with vertical lines to form a box: we erect fences around the main part of the data. We place the lower fence 1. 5 iqrs below the lower quartile. The fences are just for construction and are not part of the display. Don"t include it in your boxplot: we use the fences to grow whiskers . Draw lines from the ends of the box up and down to the most extreme data values found within the fences. These are worthy of consideration as possible outliers = suspect outliers. The center shows the middle half of the data between the quartiles. The height of the box is equal to the iqr.