G14.15

Gorilla ebola. An ebola virus outbreak in gorillas in the Congo from 2002 to 2003 killed 91 gorillas in 7 ranges. This table lists onset date relative to the outbreak (onset) and the number of home ranges separating the gorilla band from the initially infected band (distance:

Distance	Onset
1	4
3	21
4	33
4	41
4	43
5	46

1. Which variable in this analysis is independent? Which is dependent?

2. Calculate the correlation coefficient r and describe the strength of the association.

3. What percent of the variation in onset is explained by distance?.

4. Use a regression model to predict how long on average it takes the outbreak to move from one gorilla band to an adjacent band.