Question: 1 pt 22 of 40 (5 complete) This Test: 97 pts possib Question Help the

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Question: 1 pt 22 of 40 (5 complete) This Test: 97 pts possib Question Help the largest clinical trial ever conducted, 401,974 children were randomly assigned to two groups. The treatment group consisted of 201,229 children given e Salk vaccine for pollo, and the other 200,745 children were given a placebo. Among those in the treatment group, 33 developed polio, and among those nthe placebo group. 115 developed polio. If we want to use the methods for testing a claim about two population proportions to test the claim that the rate of polio is less for children given the Salk vaccine, are the requirements for a hypothesis test satisfied? Explairn Choose the correct answer below O A. The requirements are satisifed, the samples are simple random samples that are indepen dent, and for each of the two groups, the sample size is at least 1000 O B. The requirements are satisfied, the samples are simple random samples that are independent, and for each of the two groups, the number of successes is at least 5 and the number of failures is at least 5 O C. The requirements are not satisfed, the difference between the rates of those that developed polio in the two groups is not statistically significan 0 D. The requirements are not satisfied, the samples are not simple random samples that are independent Click to select your answer

Explanation / Answer

Ans:

Option B are correct.

The requirements are satisfied,the samples are simple random samples that are independent,and for each of the two groups,the number of successes is atleast 5 and number of failures is at least 5.

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