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# Lesson 6 - How to construct… • Draw whisker at point...

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Class 7 Stat 113

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Box plots A graphical representation of a variable Illustrates center, spread, and skewness Takes a 5 number summary perspective good for broad comparisons between classes of individuals For example, one might compare heights of individuals from different countries by looking at box plots for each country
Anatomy of a Box Plot Median 1 st Quartile 3 rd Quartile Possible outlier Probable outliers IQR = Q3-Q1 Outlier Cutoff point (Q3 + 1.5*IQR) Outlier Cutoff point (Q1 1.5*IQR)

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Skewness From the histogram we can see that the distribution is skewed right Notice that in the box plot, the median is closer to the bottom of the rectangle, Which represents Q1

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Unformatted text preview: How to construct… • Draw whisker at point furthest from the median, up to a distance of 1.5*IQR • Other points are drawn separately – Often as either a dot or a star – There are no universal standards for the cutoff point between drawing a dot and a star Compare Related Distributions: Beer vs Cigarette Excise Tax … • Rest of class: – Review answers to quiz1 – Review human height problem – Look through activstats chapters 2-6, prepare for exam review next class • Before next class: – Practice exam on course compass (optional) • Next class: – Review for exam • Reminder: No class this Friday, 9/17...
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Lesson 6 - How to construct… • Draw whisker at point...

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