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Spread of a data set – standard deviation & variance - Measures of Dispersion

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Spread of a data set – standard deviation & variance

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Notes:
Standard Deviation measures the average distance data values are from the mean.



note:
When the values in a data set are tightly bunched together, the standard deviation will be small.
When the values in a data set are spread apart, the standard deviation will be relatively large.

variance=σ2variance=\sigma^2
  • 1.
    Determining Population Standard Deviation VS. Sample Standard Deviation
    The heights of students (in cm) in a class are: {148, 156, 160, 164, 164, 167, 171, 176, 180, 194}
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Spread of a data set – standard deviation & variance

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