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Chapter 3: Measures of Variability
Figure 3-14:
Display with Sample Variance for
Example 3-8
Next we will compute another measure of variability called the sample
standard deviation.
Definition: Sample Standard Deviation
The sample standard deviation is the positive square root of the sample
variance.
It is computed from the following formula.
Thus, if we know the value of the variance then we can compute the value of
the standard deviation by taking the positive square root of the variance.
Also, if we know the standard deviation, ten we can obtain the variance by
squaring the standard deviation.
Example 3-9:
What is the standard deviation for the data given in
Example 3-8?
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