In the Initial Test of the Salk Vaccine for Polio $\alpha = 0.01$

question 106

Essay

In the initial test of the Salk vaccine for polio, 400,000 children were randomly 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 claim that the Salk vaccine is effective in lowering the polio rate.
Use $\alpha = 0.01$

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Definitions:

Colitis

Inflammation of the inner lining of the colon, often causing discomfort and diarrhoea.

Incontinent

Unable to control the bladder or bowel.

Anus

The opening at the end of the digestive tract through which feces leave the body.

Paralysis

The inability to control movement or sensation in some or all of the body, usually caused by sickness, toxins, or physical harm.