Boxplots allow you to compare each group using a five-number summary: the median, the 25th and 75th percentiles, and the minimum and maximum observed values that are not statistically outlying. Outliers and extreme values are given special attention.

- The heavy black line inside each box marks the 50th percentile, or median, of that distribution. For example, the median aflatoxin level of yield 1 is 21.50 PPB. Notice that the medians vary quite a bit across the boxplots.

- The lower and upper hinges, or box boundaries, mark the 25th and 75th percentiles of each distribution, respectively. For yield 2, the lower hinge value is 24.75, and the upper hinge value is 36.75.

- Whiskers appear above and below the hinges. Whiskers are vertical lines ending in horizontal lines at the largest and smallest observed values that are not statistical outliers. For yield 2, the smallest value is 22, and the largest value that is not an outlier is 52.

Outliers are identified with an O. Yield 2 has an outlying value of 68, labeled 2O, and Yield 5 has an outlier of 49, labeled 71. The label refers to the row number in the Data Editor where that observation is found. Extreme values are marked with an asterisk (*). There are no extreme values in these data.