![]() ![]() Most guidelines expect a difference between body fat for men and for women. ![]() One way to measure a person’s fitness is to measure their body fat percentage. If your data have groups, you might learn more about the data by creating side-by-side box plots, providing a simple, yet powerful, tool to compare groups. For example, if the three outliers in Figure 8 are outside the expected range of values, you would need to determine if they are valid data points or not. You may find that the outliers are errors in your data or you may find that they are unusual for some other reason. The outliers affect the mean, median, and other percentiles. Because extreme points are highlighted in a box plot, you can easily identify the data points for investigation. The variable Calories is continuous, so a box plot makes sense. The cereal data in the box plot below shows results from measuring calories per serving for 76 types of cereal.
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