Consider the data below on age, current or past clozapine use, and mortality. Age 10- Age 55- 54 94 Current Past Total Current Past Total Deaths 432 77 509 1,111 132 1,243 Person- 54,321 13,932 68,253 13,549 2,143 15,692 Years a. Calculate the stratum-specific ID and IR, the pooled ID and IR, and the 90% Cl for the pooled ID. b. Calculate the Chi-square statistic for the null hypothesis of no association between clozapine use and mortality, controlling for age