Two populations are considered: cell phone users and nonusers $n1-98$ cell phone users and n$2-102$ non$-$users are randomly selected and checked for brain cancer$-$ is the proportion of brain cancer different in these $2$ populations? Perform the $Z$ test for comparison of propartions $($Normal Theory method$)$ to test

$H_0$:$P_{bc}$ cell$-$user $=Pbc$ non cril$-$user ie $H_0$:$P_1-P_2$

$H_a$ : $Pbccel{l}_b-$user $Pbr$ non$-$cel$-$user $H_a$:$P_1+p_2$