Q$13)$ Problem $7\mathrm{.}1$ textbook page $224($shown in the pdf$).$ Assume the screws are counted only and then packaged so they are used. Do the following: State the rule$($all$),$ chart type and data points out of control $($if any$).$ If not in control place chart in control $(10$ Percent$)$

$224$ Part Two Tools and Methods for Analytic Studies

Exercises

$7\mathrm{.}1.$ A manufacturer of wood screws periodically examines screw heads for the presence or absence of burrs. Subgroups of $300$ screws are selected and examined using a carefully designed procedure. The data appear below $($see BURR$).$

a$.$ Find the centerline and standard error.

b$.$ Find the control limits and zone boundaries.

c$.$ Are there any special causes of variation? Which observations?