The test results indicate points that are beyond the control limits. A failed point indicates a nonrandom pattern in the data that may be the result of special-cause variation. You should investigate these points.

·    When a point fails a test, Minitab reports it in the Session window and marks it on the multivariate EWMA chart. A failed point indicates a nonrandom pattern in the data that may be the result of special-cause variation. Failed points should be investigated.

·    When no points are displayed under the test results, no points failed the tests for special causes.

No points failed the tests for special causes.

For the dinnerware data, the test results indicate that no points are beyond the upper control limit.