Concept/Topic
Summary for September
GPS/CCSS
13, 2011
Variability “from the
mean”
SAD= Sum of the Absolute
Deviation. It is the sum of
absolute values of the
differences of observations Not in CCSS
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 – Not in CCSS
a Level B concept, early
Level C
Level A – fair share
interpretation of the mean;
S-Id. 2/3. But the entry is left
variability from the fair
to understanding by the
share is measured by
professor and could be left to
"number of steps" to the
any understanding of mean
fair share or to “level off” the
and Standard Deviation
stack of cubes
Relationship between # of
steps to level off and the
SAD? SAD is twice the
Not in CCSS
number of steps (from level
A)
Level B – interpretation of
S-ID. 2/3. This entry again is
mean = balance point
vauge and left to
interpretation.
Level C – How do we take a
sample mean and make an
inference about a
population mean? “How
S-IC 1.
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
S-ID 4. Here too the CCSS is
differences rather than taking
vauge.
absolute value of differences
but interpretation of MAD
and StDev are similar)