Refer to given Exercise and the data for the percentage of potassium content in a compound. Suppose that we wish to detect an out-of-control condition with a probability of 0.90 if the process is producing at a nonconformance rate of 4%. Determine the acceptance control chart limits.
Exercise
The percentage of potassium in a compound is expected to be within the specification limits of 18-35%. Samples of size 4 are selected, and the mean and range of 25 such samples are shown in given Table. It is desirable for the process nonconformance to be within 1.5%. If the acceptable level of type I error is 0.05, find the modified control limits for the process mean.
