Homework Answers
The appropriate control chart for this process will be S chart.
As per standard formula,
Upper Control Limit for S chart = UCLs = m + A3*S
Where ,
Population mean = m = 120
A3 = 0.789 ( for Sample size = n = 16 as derived from standard table for Xbar and r chart )
S = Standard deviation of process = 14.84
Therefore ,
UCLs = 120 + 0.789 x 14.84 = 120 + 11.71 = 131.71
|
THREE SIGMA UPPER CONTROL LIMIT OF THE PROCESS = 131.71 |
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