Please pick the correct answer In the largest cllinical tria

Please pick the correct answer

In the largest cllinical trial ever conducted, 401,974 children were randomly assigned to two groups. The treatment group consisted of 201,229 children given the Salk vaccine for polio, and the other 200,745 children were given a placebo. Among those in the tretment group, 33 developed polio, and among those in the plcacebo 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 gibven the Salk vaccine, are requirements for a hypothesis test satisfied? Explain.

Solution

Teh requirements for the two sample test for proprotions:

1. Each sample should have at least 5 successes and 5 failures.

2. Each population is at least 20 times as big as its sample.

In teh given case both requiremet are statisfied. hence, option D is correct.