10.70 Two chemicals, A and B, are designed to protect pine trees from a certain disease. One hundred trees are sprayed with chemical A, and 100 are sprayed with chemical B. All trees are subjected to the disease, with the following results:

Do the chemicals appear to differ in their ability to protect the trees? Test at the 1% significance level.

Transcribed Image Text:

A B Infected 20 16 Sample size 100 100