STAT 213 Lecture 4: lec4
21 Jul 2015
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Another visual representation of a distribution is boxplot. Boxplots based on the ve-number summery are useful for comparing several distributions. The box spans the quartiles and shows the spread of the central half of the distribution. Lines extend from the box to the extremes and show the full spread of the data. (the points identi ed by the 1. 5 iqr criterion are often plotted individually). Consider the following test results for calories and milligrams of sodiumin a number of hot dogs (see. The ve-number summeries of the distributions of calories. We can see that no observations fall more than 1. 5 iqr outside the quar- tiles. Figure 1. 16 presents boxplots based on these calculations. Figure 1. 16 also illustrates why boxplots are generally inferior to stem- 129 plots and histograms as displays of a single distribution. Let us make a stemplot of the calorie content of the 17 brands of meat hot dogs:
