After two years of data collection, or a minimum of 20 data points, the control chart should be maintained using only the 20 most recent data points.
By using the most recent 20 data points, the control chart will be accurate and maintained.
mnli hypothesis: By using the most recent 20 data points, the control chart will be accurate and maintained. premise: After two years of data collection, or a minimum of 20 data points, the control chart should be maintained using only the 20 most recent data points.