Question: Control charts for X bar and s are maintained on the breaking strength in pounds for a wire. The subgroup size is n=10. The values

Control charts for X bar and s are maintained on the breaking strength in pounds for a wire. The subgroup size is n=10. The values of x bar and s are computed for each subgroup. After collecting 30 subgroups it was calculated that Exj=4500 and E sj= 135. Compute the centerlines and the 3- sigma control limits for X-bar and S charts

if there are two points out of control limits from the control chart, can you use the control limits for future SPC? Why?

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