© 2004 Cayman Business
Systems
Rev:
Pre-G3 - Rendered Thursday,
February 12, 2004
Slide 26
Elsmar.com --- The
Cove!
8-Disciplines Problem Solving
Elsmar.com
Basic Terms
This is X-Bar. It tells us the Average of
a group of numbers (in this case average height). X-Bar is the middle of the curve where we have the largest percentage of men.
s = sigma = Standard Deviation
s is the Greek letter Sigma. It is the distance
from the center of the curve to
the point where the curve stops
curving downward and starts
curving outward. We’re interested in
points at 1, 2 and 3 Standard
Deviations from the Mean (the center).
Mean
If we
measure 1 Standard Deviation on
each side of the center of the curve
, 68% of the Area will be between
the lines drawn through these
points.
The Human Proportions table tells us the Standard Deviation (s - dispersion)
of men’s heights is 0.07 meters,
so by simple addition and subtraction
we know that 68% of the men
are between 1.73 and 1.87 meters.
1.8 + 0.07 = 1.87
1.8 - 0.07 = 1.73
X = X-Bar = Average