*Estimate of the Standard Deviation
The
standard deviation
, a measure of the spread of
N
values,
X
i
,
about the average value,
s
, a measure of precision, is given
by,
The Standard Deviation
If the number of values,
N
, is small
,
i.e.
, if
N
< 30, an
estimate
of the standard deviation
,
s
, is given by,
The
standard deviation
is used for
large populations, N
≥ 30
.
*We will be using the
Estimate of the
Standard Deviation
because we have a
small data set.