A Quality Analyst wants to construct a control chart for determining whether four machines,all producing the same product,are under control with regard to a particular quality attribute.Accordingly,she inspected 1,000 units of output from each machine in random samples,with the following results: 
What are the control chart upper and lower control limits for an alpha risk of .05?
Definitions:
Autonomic Nervous System
The part of the nervous system responsible for controlling involuntary body functions, like heart rate, digestion, and breathing.
Somatic Nervous System
A part of the peripheral nervous system that controls voluntary movements of the body and transmits sensory information to the central nervous system.
Sympathetic Nervous System
Part of the autonomic nervous system responsible for the body's 'fight or flight' response to stress.
Parasympathetic Nervous System
A branch of the autonomic nervous system responsible for conserving energy and bringing the body to a restful state.
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