As research for an ecology class, university students in Alberta collect data on streams each year to study the impact of pollution on the environment. They record a number of biological, chemical, and physical variables, including the stream name, the substrate of the stream (limestone, shale, or mixed), the acidity of the water (pH), the temperature (°C), and the BCI (a numerical measure of biological diversity).

Identify the Five W’s, name the variables, specify for each variable whether its use indicates it should be treated as categorical or quantitative, and for any quantitative variable identify the units in which it was measured (or note that they weren’t provided or that the variable doesn’t have units).