11. Samples of n = 6 items are taken from a manufacturing process at regular intervals. A normally distributed quality characteristic is measured, and X and S values are calculated for each sample. After 50 subgroups have been analyzed, we have

(a) Compute the control limit for the X - and S-control charts. Assume that all points on both charts plot within the control limits.

(b) If the specification limits are 19 ± 4.0, what are your conclusions regarding the ability of the process to produce items conforming to specifications?

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50 . = 970 and i=1 50 - 5; = 85 i=1