4. A study to assess the capability of subsurface flow wetland systems to remove biochemical oxygen demand

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4. A study to assess the capability of subsurface flow wetland systems to remove biochemical oxygen demand (BOD) 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 Envir. Res., 1995:

244–247).

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

b. Construct a scatter plot of the data, and comment on any interesting features.

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