For $\bar { X }$ Charts, a Set of Eight Tests Can Be Used to Tests

Multiple Choice

For $\bar { X }$ charts, a set of eight tests can be used to signify that a process is out of control."Out of control" is indicated if:

A) all eight tests are positive.
B) only one of eight is positive.
C) more than half the tests are positive.
D) half or more tests are "borderline."