The boxplot conveys the following information about the distribution of the differences:

·    The box represents the middle 50% of the differences.

·    The line through the box represents the median difference.

·    The lines extending from the box represent the upper and lower 25% of the differences (excluding outliers).

·    Outliers are represented by asterisks (*).

The boxplot of the difference indicates that there are no outliers. The distribution appears to be symmetrical, with little or no skew.