Suppose 
for a population.In a sample where n = 100 is randomly taken, 90% of all possible sample means will fall between 49 and 51.
Definitions:
Autonomic System
Portion of the peripheral nervous system that regulates internal organs.
SA Node
The sinoatrial node, a group of cells located in the right atrium of the heart, acts as a natural pacemaker by generating electrical impulses that initiate each heartbeat.
Pacemaker
Cells of the sinoatrial node of the heart; electrical device designed to mimic the normal electrical patterns of the heart.
Hepatic Portal Vein
A vein that transports blood to the liver from the spleen and gastrointestinal tract.
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