Chap. $6,$ problem $4$ on page $216($p$.211$ in the $7^($th $)$ edition$).$ Be sure to include both an x$-$bar chart and R chart. Use the range method to calculate upper and lower control limits for the x$-$bar chart. In your work show the important parameters $($n$,$A$\_(2),$D$\_(3),$D$\_(4)).$ Chap. $6,$ problem $8$ on page $216($p$.211$ in the $7^($th $)$ edition$).$ When you hand in your assignment be sure that it appears complete and professional or otherwise points may be deducted.