Question: Streams. As part of the course work, a class at an upstate NY college collects data on streams each year. Students record a number of biological, chemical, and physical variables, including the stream name, the substrate of the stream (limestone, shale, or mixed), the pH, the temperature (°C), and the BCI, a measure of biological diversity.
Group Count %
Limestone 77 44.8
Mixed 26 15.1
Shale 69 40.1
a) Name each variable, indicating whether it is categorical or quantitative, and giving the units if available.
b) These streams have been classified according to their substrate - the composition of soil and rock over which they flow - as summarized in the table. What kind of graph might be used to display these data?