In a large clinical trial, 397,233 children were randomly assigned to two groups. The treatment group consisted of 199,785 children given a vaccine for a certain disease, and 28 of those children developed the disease. The other 197,448 children were given a placebo, and 101 of those children developed the disease. Consider the vaccine treatment group to be the first sample. Complete parts (a) through (d) below. b. In general, when dealing with interences tor two population proportions, which two of the following are equivalent: confidence interval method; P-value method; critical value method