Question

The UCL and LCL for an x-bar chart are 25 and 15 respectively and the centerline is 20. The process range is considered to be in statistical control. The results of the next seven sample means are 21, 23, 22, 21, 24, 23, and 16. What should you do

Answer 1

nothing

Explanation:

you do not have to do anything given these seven sample means. This is because the sample means are all within the upper and the lower control limits. the plots are randomized and they do not form any patterns. This process is still in control so you do not really have to do anything. This answers the question.