PLEASE DO THIS USINH EXCEL The diameter of cotter pins produced by an automatic machine is a characteristic of interest. Based on historical data, the process average diameter is $15$mm with a process standard deviation of $0\mathrm{.}8$mm$.$ If samples of size $4$ are randomly selected from the process, the $2\backslash$sigma upper and lower control limits for the phase II X$$ chart are $[1]$ and $[2],$ respectively.