Control Test 7

N Subgroups in a Row in Zone C, Above or Below Center

This test checks to see if N subgroups in a row lie in Zone C on either side of the center line. The Nth subgroup and all the following subgroups that meet the test criteria will be marked with a red asterisk.

For example, if N=15:

More information

Step 3.6. Set criteria for variable control tests.