EWMA Chart - Options - Tests
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Stat  > Control Charts > Time-Weighted Charts > EWMA > EWMA Options > Tests

Specify the number of standard deviations from the center line that causes a point to fail the test.

When a point fails, it suggests a special cause for the variation that you should investigate. Minitab marks it in red on the plot.

You can choose to change the color of a control chart when the last row of data causes a new test failure for any point. See Tools > Options > Control Charts and Quality Tools > Other.

You can set the default sensitivity of this test using Tools > Options > Control Charts and Quality Tools > Tests.

The test results are displayed in the Session window. If the data change and the control chart is live-linked, the test results are not updated in the Session window. See Updating Graphs for more information.

Minitab will perform tests when subgroup sizes are unequal.

See [1] and [32] for guidance on using these tests.

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