# Refer to the Journal of Agricultural, Biological, and Environmental Statistics (Mar. 2005) study of the chemical composition of rainwater, presented

## Question:

a. Write a first-order model for E(y) as a function of the independent variables. Assume that the rate of increase of nitrate concentration with silica concentration is the same for all three water sources. Sketch the relationships hypothesized by the model on a graph.

b. Write a first-order model for E(y) as a function of the independent variables, but now assume that the rate of increase of nitrate concentration with silica concentration differs for the three water sources. Sketch the relationships hypothesized by the model on a graph.

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