River Bottom Fire Department $($Prob$.8-22)$ deter$-$mined that they needed to adjust their data$-$ gathering process for response time to eliminate bias. The times were expected to fall within $3\mathrm{.}8$ and $5\mathrm{.}3$ minutes. After doing so$,$ they wanted to evalu$-$ ate the process to determine whether or not it was under control. Thirty new samples were taken on $30$ random days from $6$ stations. These data can be found in the worksheet Prob. $8-25$ in the C$08$Data.xlsx file on the Student Companion Site for this chapter.$$a$.$ Compute the mean and range of each sample, calculate control limits$,$ and plot them on x and R control charts.$$b$.$ Does the process appear to be in statistical con$-$ trol? Calculate descriptive statistics that may help you to determine the answer to this question. What evidence is there for your conclusion?