A) An X control chart was set up based on subgroups of size n = 5. The UCL is 120. The LCL is 80. The centerline is 100. Estimate the following: Estimate the standard deviation of the process (note standard error of x of (std. deviation/sqrt(n=5) was used to set up control chart limits).
B) If mean of process shifts to 105, what is the probability that the next subgroup average will plot outside of the control limits.