In a large clinical trial, 393,888 children were randomly assigned to two groups. the treatment group consisted of 198,120 children given a vaccine for a certain disease, and 38 of those children developed the disease. the other 195,768 children were given a placebo, and 116 of those children developed the disease. consider the vaccine treatment group to be the first sample.1. assume that a 0.05 significance level will be used to test the claim that p1 < p2. which is better: a hypothesis test or a confidence interval? 2. if a 0.05 significance level is to be used to test the claim that p1 < p2, what confidence level should be used? (type an integer or a decimal.)