Analyzes observed differences in the process standard deviation at different levels (settings) of an input. To use the test for equal variances, you must collect a sample at each level of the input.
|When to Use||Purpose|
|Mid-project||Fixing an input at two or more different settings (levels) helps determine which inputs have significant influence on the variation in the output.|
|Mid-project||Verify changes to inputs result in significant differences from the pre-project standard deviation.|
Continuous Y (output), usually a single X (input) at 2 or more levels.