Question: Researchers at the University of Aberdeen Scotland developed a statistical

Researchers at the University of Aberdeen (Scotland) developed a statistical model for estimating the chemical composition of water (Journal of Agricultural, Biological, and Environmental Statistics, March 2005). For one application, the nitrate concentration y (milligrams per liter) in a water sample collected after a heavy rainfall was modeled as a function of water source (groundwater, subsurface flow, or over-ground flow).
a. Write a model for E (y) as a function of the qualitative independent variable.
b. Give an interpretation of each of the b parameters in the model you wrote in part a .

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