QuestionIn a large clinical trial, 398,546 children were randomly assigned to two groups. The treatment group consisted of 197,285 children given a vaccine for a certain disease, and 28 of those children developed the disease. The other 201,261 children were given a placebo, and 98 of those children developed the disease. Consider the vaccine treatment group to be the first sample. Identify the values of $n_{1}, \hat{p}_{1}, \hat{q}_{1}, n_{2}, \hat{p}_{2}, \hat{q}_{2}, \bar{p}$, and $\bar{q}$. $$n_{1}=\square$$