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Comparison of standard deviations

Sample 1

Sample 2


Performs an F-test to compare the known standard deviations of two independent samples.

Required input

For both samples, you enter:

  • Standard deviation: the observed standard deviation.
  • Sample size: the sample size or total number of observations in the sample.


In this test, the square of the standard deviations is calculated to obtain the corresponding variances, and an F-test is performed.

If the P-value is less than 0.05, the conclusion is that the two standard deviations indeed differ significantly.

How to cite this page

  • MedCalc Software Ltd. Comparison of standard deviations. (Version 22.023; accessed April 18, 2024)