Provide an Appropriate Response $\alpha = 0.01$

Short Answer

Provide an appropriate response.
-In the initial test of the Salk vaccine for polio, 400,000 children were selected and divided into two groups of 200,000 . One group was vaccinated with the Salk vaccine while the second group was vaccinated with a placebo. Of those vaccinated with the Salk vaccine, 33 later developed polio. Of those receiving the placebo, 115 later developed polio. Test the hypothesis that the Salk vaccine is effective in lowering the polio rate. Use $\alpha = 0.01$ .