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Summary for September
13, 2011
Variability “from the
SAD= Sum of the Absolute
Deviation. It is the sum of
absolute values of the
MM2d1 b.
differences of observations
from mean; Level B concept,
Early Level C
MAD=Mean Absolute
Deviation. It is the average of
the distances of the
observations from the mean –
a Level B concept, early
Level C
Level A – fair share
interpretation of the mean;
variability from the fair
M6D1 d.
share is measured by
"number of steps" to the
fair share or to “level off” the
stack of cubes
Relationship between # of
steps to level off and the
MM2D1 b.
SAD? SAD is twice the
number of steps (from level
Level B – interpretation of
MM2D1 c.
mean = balance point
Level C – How do we take a
sample mean and make an
inference about a
M7D1 e.
population mean? “How
close can we expect our
sample mean to be to the
population mean?”
Level C – measure
variability by Standard
Deviation (differs from
MAD by squaring
MM3D2 a.
differences rather than taking
absolute value of differences
but interpretation of MAD
and StDev are similar)