User:Globber

${\hat {p}}_{1}\ =.65$

$n_{1}=4066\,\!$

${\hat {p}}_{2}\ =.43$

$n_{2}=3315\,\!$

${\hat {p}}\ =.54$

$\alpha \ =.01$

$z={\frac {{\hat {p}}_{1}-{\hat {p}}_{2}}{\sqrt {{\hat {p}}{\hat {q}}({\frac {1}{n_{1}}}+{\frac {1}{n_{2}}})}}}$

$z={\frac {.65-.43}{\sqrt {.54\times .46({\frac {1}{4006}}+{\frac {1}{3315}})}}}$