A manufacturing company produces metal washers and measures their thickness to ensure consistency. The thickness measurements (in mm) are taken from 5 washers per day for 5 consecutive days. The data is presented below: The average range (R̅) for these samples is 0.062. LCL for the R-chart = 0 UCL for the R-chart = 0.131 Treat the five measurements from each day as a sample and construct an R chart. What does the chart suggest about the stability of the process?
