Please double check my answers and explanation. Problem $4(($You do not need check Table $10\mathrm{.}3)$: instead of checking Table $10\mathrm{.}3,$ use A$2=0\mathrm{.}58$; D$3=0$; D$4=2\mathrm{.}11.)4.$ Software upgrade times $($in minutes$)$

are being evaluated. Samples of five

observations each have been taken,

and the results are as listed. Using

factors from Table $10\mathrm{.}3,$ determine

upper and lower control limits for

mean and range charts, and decide if

the process is in control.

The process is in control

since there are no

points that fall outside

the control limits$,$ and

the variation within the

process is consistent.