Examine Fig. 15. (a) What is the composition of the soil marked Y? (b) What is the name of the soil with the following composition: 15% silt, 70% sand, 15% clay?
5. Scatter plots
Scatter plots show clusters of data and the relationships between two variables, e.g. bedload roundness and distance from a river’s source.
SCATTER PLOTS
10 15 20 25 30 35 40
5 0
Site 1 Site 2 Site 3
Fig. 17 Scatter plot showing bedload size of 10 stones at three sites along a river
EXERCISE
Examine Fig. 17. (a) What is the range in stone sizes at sites 1, 2 and 3?
(b) What is the average size of stones at site 2? (c) Find the average size of stones at each site and plot the data as a trend graph of site against average size.