In Exercise 9.23 on page 537, we discuss a study conducted on the California Channel Islands investigating the prevalence of hantavirus in mice. This virus can cause severe lung disease in humans. The article states: ‘‘Precipitation accounted for 79% of the variation in prevalence. Adding in island area upped this to 93%, and including predator richness took the total to 98%.”
(a) Give the correct notation or terminology for the quantity the scientists are comparing in the quotation.

(b) Based on the information given, do you expect the ANOVA p-value for the model with all three predictors to be relatively large or relatively small? Explain.

Exercise 9.23 on page 537

Hantavirus is carried by wild rodents and causes severe lung disease in humans. A recent study on the California Channel Islands found that increased prevalence of the virus was linked with greater precipitation. The study adds ‘‘Precipitation accounted for 79% of the variation in prevalence.’’