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Chapter8part2

Chapter8part2 - Testing the Difference between Two...

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Characteristics of the F Distribution In addition to comparing two means, statisticians are interested in  comparing two variances or standard deviations. For example, is the  variation in the temperatures for a certain month for two cities  different? In another situation, a researcher may be interested in comparing  the variance of the cholesterol of men with the variance of the  cholesterol of women. For the comparison of two variances or  standard deviations, an  test  is used. The  test should not be  confused with the chi-square test, which compares a single sample  variance to a specific population variance, If two independent samples are selected from two normally  distributed populations in which the variances are equal  2 2 2 1 σ =  and  if the samples variances  2 1 s and  2 2 s  are compared as 2 2 2 1 distribution.

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Chapter8part2 - Testing the Difference between Two...

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