Conditions for the Effectiveness of a Preliminary Test of Variance

We evaluate the performance of the F test for the equality of two variances as a preliminary test to determine the appropriateness of the two-sample t test. When sampling is from a normal distribution, our results indicate that, for equal sample sizes, the t test is insensitive to variance heterogen...

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Veröffentlicht in:	The American statistician 1990-11, Vol.44 (4), p.322-326
Hauptverfasser:	Markowski, Carol A., Markowski, Edward P.
Format:	Artikel
Sprache:	eng
Schlagworte:	Commentaries Exact sciences and technology Gaussian distributions Homogeneity of variance Mathematics Population mean Preliminary F test Probability and statistics Random sampling Sample size Sampling distributions Sciences and techniques of general use Significance level Standard deviation Statistical discrepancies Statistical variance Statistics T tests Two-sample t test
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