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The manager of the injection molding department has asked you to make a EWMA chart for a maintenance operation-weekly mold changes.
The manager of the injection molding department has asked you to make a EWMA chart for a maintenance operation-weekly mold changes. The table of data below shows the number of mold changes for the last 45 weeks. Construct EWMA charts using r = 0.33. Identify any statistical signals on the charts or other trend like patterns. What can you report to the manager about the mold-changing process? Make sure your report includes the following: estimates of the process mean and standard deviation, exponentially weighted moving averages, control limits and centerlines, EWMA Control Charts, and comments to the manager.
