efer to Table S$6\mathrm{.}1-$ Factors for Computing Control Chart Limits $(3$ sigma$)$ for this problem.

ito pistons at Wemming Chung's plant in Shanghai are produced in a forging process, and the diameter is a critical factor that must be controlled. From sample sizes of $10$ piston oduced each day, the mean and the range of this diameter have been as follows:

$\backslash$table$[[$Day$,\backslash$table$[[$Mean $\stackrel{}{x}$