A process manufacturing missile component parts is being controlled, with the performance characteristics being the tensile strength in pound per square inch. Samples of size $5$ each are taken every hour and $25$ samples are reported. The data are shown in below Table.

a$.$ Plot the data using $\stackrel{}{x}$ and $R$ charts for the data.

b$.$ Does the process appear to be in control? If not, explain why.

c$.$ Repeat part $($a$)$ and $($b$)$ using $\stackrel{}{x}$ and $S$ charts. Comment whether the process is control or out of control.