Question: A process that is under statistical control is using the 3-sigma control limits UCL and LCL given below, for an Xbar chart. Calculate the estimated

A process that is under statistical control is using the 3-sigma control limits UCL and LCL given below, for an Xbar chart. Calculate the estimated standard deviation of the measured attribute X.

n	9
LCL	87
UCL	93
CL
sigma_Xbar
sigma_X

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