A study to assess the capability of subsurface flow wetland systems to remove biochemical oxygen demand (BOD, a measure of organic matter in sewage) and various other chemical constituents resulted in the accompanying data on x = BOD mass loading (kg/ha/d) and y = BOD mass removal (kg/ha/d) (“Subsurface Flow Wetlands—A Performance Evaluation,” Water Environ. Res. 1995: 244–247).

a. Construct boxplots of both mass loading and mass removal, and comment on any interesting features.
b. Construct a scatterplot of the data, and comment on any interesting features.

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X y X y 3 4 30 26 8 7 35 21 10 8 37 9 11 8 38 31 13 10 44 30 16 11 103 75 27 16 142 90