Question: Specifications on a normally distributed dimension are 600 20. X bar and R charts are maintained on this dimension and have been in control over

Specifications on a normally distributed

Specifications on a normally distributed dimension are 600 20. X bar and R charts are maintained on this dimension and have been in control over a long period of time. The parameters of these control charts are as follows (n = 9) X bar chart R chart UCLx_bar= 616 UCLR= 32.36 Cbx bar=610 CLR= 17.82 LCLx bar= 604 LCLR= 3.28 (a) What are your conclusions regarding the capability of the process to produce items within specifications? (15p) b) A new sample of size 12 is taken, and sample average is computed as 613. Can we say that process mean shifted up at 5% significance level (10p(+5p bonus))

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