Given the following process control data for a quality attribute $($three samples of size $400$ each$)$:

If the process proportion of defectives is unknown, what is the alpha risk $($probability of Type I error$)$ for upper and lower control limits of $\mathrm{.}115$ and $\mathrm{.}085$ respectively? $.13$ and $\mathrm{.}07?145$ and

$\mathrm{.}055?$