Many insect populations show explosive increase in numbers during a certain amount of rainfall. The following plot shows the relationship between the population Size (in thousand) and the amount of Rainfall (in mm) for certain insect species. (Data in Insect Populations)

a) Describe the relationship between Size and Rainfall.
Explain what this says in terms of population size.

b) A linear regression of Size on Rainfall shows that the slope for Rainfall is not statistically significant. Is Size unrelated to Rainfall? Explain.

c) What might you do instead?

Transcribed Image Text:

Size 13000 11000 9000 Size 7000 5000 3000 1000 18 28 38 48 58 Rainfall -80 68 78