TABLE $6$ E$.19$

New Data for Exercise $6\mathrm{.}43$

$6\mathrm{.}43.$ Continuation of Exercise $6\mathrm{.}42.$ Reconsider the data

from Exercise $6\mathrm{.}42$ and establish $\stackrel{}{x}$ and $R$ charts with

appropriate trial control limits$.$ Revise these trial lun$-$

its as necessary to produce a set of control charts for

monitoring future production. Suppose that the net

data in Table $6E,19$ are observed.

$($a$)$ Plot these new observations on the control chant.

What conclusions can you draw about proces

stability?

$($b$)$ Use all $25$ observations to revise the control liat

its for the $\stackrel{}{x}$ and $R$ charts. What conclusions can

you draw now about the process?