Does a $$follow$-$up reminder$$ increase the renewal rate on a magazine subscription? A magazine

sent out $760$ subscription renewal notices $($without a reminder$)$ and got $703$ renewals. As an experiment, they sent out $240$ subscription renewal notices $($with a reminder$)$ and got $228$ renewals. $($a$)$ At

$\backslash$alpha $5\mathrm{.}05,$ was the renewal rate higher in the experimental group? $($b$)$ Can normality be assumed?