Chemical composition of rain water. The Jour- nal of Agricultural, Biological, a

Question

Chemical composition of rain water. The Jour- nal of Agricultural, Biological, and Environmental Statistics (March 2005) presented a study of the chemical composition of rain water. The nitrate concentration, y (milligrams per liter), in a rain water sample was modeled as a function of two independent variables: water source (groundwater, subsurface flow, or overground flow) and silica con- centration (milligrams per liter). Identify the type (quantitative or qualitative) for each independent variable.

Explanation / Answer

Independent variable: Water Source

It is a qualitative variable. Possible values are: groundwater, subsurface flow, or overground flow

Independent variable: Silica_con

It is a quantitative variable. Unit : milligrams per liter

Possible values : Not given

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