20. A comparative psychologist tests rats, chimpanzees, and humans on a particular learning task. The following table shows the numbers of each species that were and were not able to learn the task. Is there a relation between species and ability to learn this task (use the .01 level)?

(a) Carry out the steps of hypothesis testing.

(b) Make a sketch of the distribution.

(c) Explain your answer to a person who has never taken a course in statistics.

Species Rat Chimpanzee Human Learned Task Yes 2 4 14 No 28 16 6