Two Kinds Of Errors DCOVA Treating common cause variation as special cause variation Results in over overadjusting known as tampering Increases process variation Treating special cause variation as common cause variation Results in not taking corrective action when it should be taken Utilizing control charts greatly reduces the chance of committing either of these errors Statistics for Managers Using Microsoft Excel Statistics for Managers Using Microsoft Excel Two Kinds Of Errors  Treating common cause variation as special cause variation  Results in over overadjusting known as tampering  Increases process variation  Treating special cause variation as common cause variation  Results in not taking corrective action when it should be taken  Utilizing control charts greatly reduces the chance of committing either of these errors DCOVA