Section 3.5 Summary

1. The fve-number summary is an alternative to the usual mean-and-standard-deviation method of summarizing a data set. It consists of simply reporting the minimum, frst quartile, median, third quartile, and maximum of the data set.
2. A boxplot is a graphical representation of the fve-number summary, and is useful for investigating skewness and the presence of outliers.
3. The IQR method of detecting outliers is to consider a data value an outlier if it is located 1.5(IQR) or more below Q1, or it is located 1.5(IQR) or more above Q3.