6.3. Standard Deviation of a Data Set http://www.ck12.org
6.3 Standard Deviation of a Data Set
Here you’ll learn the meaning of standard deviation, understand the percents associated with standard deviation, and
calculate the standard deviation for a normally distributed random variable.
Suppose you measured the weights of all the students in your high school. How could you determine the measure of
the spread of this data from its mean? How could you compare this sample with the mean of the weights of a general
population of high school students?
Watch This
First watch this video to learn about standard deviation of normally distributed data.
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Click image to the left for more content.CK-12 Foundation: Chapter6StandardDeviationofNormallyDistributedDataA
Then watch this video to see some examples.
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Click image to the left for more content.CK-12 Foundation: Chapter6StandardDeviationofNormallyDistributedDataB
Watch this video for more help. This video from Khan Academy shows how to calculate the variance and the
standard deviation of a population and a sample.
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Click image to the left for more content.Khan Academy Statistics: Standard Deviation
Guidance
In a previous concept, you learned that standard deviation is a measure of the spread of a set of data away from the
mean of the data.