- Chi-square test for variance
(test whether population
**variance**is equal to hypothesized value) - F test (test
whether two population
**variances**are equal) - Levene's test (test
whether multiple population
**variances**are equal) - Bartlett's test (test
whether multiple population
**variances**are equal) - Ansari-Bradley test (test
nonparametrically whether two population
**dispersions**(scales) are equal)

The full version of StatGuide for

- importance of homogeneity of variance
- Gaussian (normal) distribution assumption
- violation of assumptions

- Brownlee, K. A. 1965.
*Statistical Theory and Methodology in Science and Engineering.*New York: John Wiley & Sons. - Daniel, Wayne W. 1995.
*Biostatistics.*6th ed. New York: John Wiley & Sons. - Miller, Rupert G. Jr. 1986.
*Beyond ANOVA, Basics of Applied Statistics.*New York: John Wiley & Sons. - Rosner, Bernard. 1995.
*Fundamentals of Biostatistics.*4th ed. Belmont, California: Duxbury Press. - Sokal, Robert R. and Rohlf, F. James. 1995.
*Biometry.*3rd. ed. New York: W. H. Freeman and Co. - Zar, Jerrold H. 1996.
*Biostatistical Analysis.*3rd ed. Upper Saddle River, NJ: Prentice-Hall.

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