In the largest clinical trial ever conducted 400 1974 children were randomly assigned to two groups the treatment group consists of 201229 children given the socs vaccine for polio the other 200745 children were given a placebo among those in the treatment Group 33 developed polio and among those in the placebo group 115 developed polio if we want to use the method for testing a claim about two population proportions to test the claim that the rate of polio is left for children given the Sox vaccine are the requirements for a hypothesis test satisfied

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