The following statistics are drawn from two independent samples: 
, 
; 
, 
. Test at the 5% significance level to determine whether the two population locations differ.
Definitions:
Positive-Feedback Mechanisms
Biological processes in which a change leads to an even greater change in the same direction, often leading to a rapid completion of the process.
Superior
In anatomical terms, superior refers to a part of the body that is above or positioned higher relative to another part.
Inferior
A term used in anatomy to describe a structure or location that is below or lower than another part of the body; opposite of superior.
Posterior
Situated behind or at the back part of an organism or structure, opposite of anterior.
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