In-control Process DCOVA A process is said to be in control when the control chart does not indicate any out-of-control condition Contains only common causes of variation -If the common causes of variation is small,then control chart can be used to monitor the process -If the common causes of variation is too large,you need to alter the process Statistics for Managers Using Microsoft Excel
Statistics for Managers Using Microsoft Excel In-control Process A process is said to be in control when the control chart does not indicate any out-of-control condition Contains only common causes of variation If the common causes of variation is small, then control chart can be used to monitor the process If the common causes of variation is too large, you need to alter the process DCOVA
Process In Control DCOVA Process in control:points are randomly distributed around the center line and all points are within the control limits UCL Process Mean LCL time Statistics for Managers Using Microsoft Excel
Statistics for Managers Using Microsoft Excel Process In Control Process in control: points are randomly distributed around the center line and all points are within the control limits UCL LCL time Process Mean DCOVA
Process Not in Control DCOVA Out-of-control conditions: One or more points outside control limits 8 or more points in a row on one side of the center line Statistics for Managers Using Microsoft Excel
Statistics for Managers Using Microsoft Excel Process Not in Control Out-of-control conditions: One or more points outside control limits 8 or more points in a row on one side of the center line DCOVA
Process Not in Control DCOVA One or more points outside Eight or more points in a row control limits on one side of the center line UCL UCL Process Process Mean Mean LCL LCL Statistics for Managers Using Microsoft Excel
Statistics for Managers Using Microsoft Excel Process Not in Control One or more points outside control limits UCL LCL Eight or more points in a row on one side of the center line UCL LCL Process Mean Process Mean DCOVA
Out-of-control Processes DCOVA When the control chart indicates an out-of- control condition (a point outside the control limits or 8 points in a row on the one side of the centerline,for example) Contains both common causes of variation and special causes of variation The special causes of variation must be identified If detrimental to the quality,special causes of variation must be removed If increases quality,special causes must be incorporated into the process design Statistics for Managers Using Microsoft Excel
Statistics for Managers Using Microsoft Excel Out-of-control Processes When the control chart indicates an out-ofcontrol condition (a point outside the control limits or 8 points in a row on the one side of the centerline, for example) Contains both common causes of variation and special causes of variation The special causes of variation must be identified If detrimental to the quality, special causes of variation must be removed If increases quality, special causes must be incorporated into the process design DCOVA