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?