Perhaps the size of an animal’s brain determines intelligence for that species. Or perhaps the weight of the brain. Or perhaps their body size or weight have a role. The following chart compares several animals’ brain and body sizes and weights.

Calculate the correlation coefficient and use it and Table 10 of Appendix B to determine a 95% confidence interval on for each of the following cases:

a. Brain length and brain weight

b. Brain length and body weight

c. Brain weight and body weight

Brain Length Brain Weight Body Length Body Weight Species (cm) (g) (cm) (g) Human 15 1400 100 62,000 Baboon 8 140 75 30,000 Monkey 5 100 30 7,000 Camel 15 680 200 529,000 Dolphin Missing 1700 305 160,000 Kangaroo Cat 55 5 56 150 35,000 5 30 60 3,300 Raccoon 5.5 39 80 4,290 Rabbit Squirrel Frog 53 5 12 30 2,500 3 6 20 900 2 10 0.1 10 18