The results of a trial involving an experimental vaccine for children are shown below. 9 Developed u Did not develop u Vaccine treatment 52 356 Placebo 74 426 a. State the relevant null and alternative hypotheses. b. Conduct the appropriate test and state a conclusion. Use a signicance level of 0.01. a. Determine the null and alternative hypotheses. Choose the correct answer below. 0 A. HO: Treatment method and u development have non-equal proportions. HA: Treatment method and u development have equal proportions. O B. HO: Treatment method and u development have equal proportions. HA: Treatment method and u development have non-equal proportions. O C. HO: There is a relationship between treatment method and development of u. HA: Treatment method is independent of u development. 0 D. HO: Treatment method is independent of u development. HA: There is a relationship between treatment method and development of u. b. Calculate the test statistic. 2 _ . x |:| (Round to three deCImal places as needed.) Calculate the p-value. p-value = D (Round to four decimal places as needed.)