A. a level shift.
B. a trend.
C. a cycle.
23) In statistical process control, a Type I error occurs if we decide that the process is
A. under control when it is out of control.
B. out of control when it is out of control.
C. under control when it is under control.
D. out of control when it is under control.
24) When the only sources of variation in a production process are caused by chance, the process is said to be
A. out of balance but under control.
B. under control.
C. out of control but in balance.
D. out of control.
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