ABSTRACT
No. All of the new measurements are within the control limits. 16.11 For each of the sampling times, we will compute the sample mean pin lengths
and the sample ranges.
= = =x x
n 9.958 10 0.9958.
b. R R
n 0.740 10 0.074
i∑ = = =
From Table 19, Appendix B, with n 5,= A 0.577.2 = Upper control limit = + = + =x A R 0.9958 0.577(0.074) 1.03852 Lower control limit = − = − =x A R 0.9958 0.577(0.074) 0.95312 c. The x-chart is:
d. The Defense Department’s specification is that the firing pins be 1.00 0.08± or from 0.92 to 1.08. Since all of the sample means are well within this range, the manufacturing process appears to be in control.
