October 2012
Beginner
420 pages
9h 37m
English
book
Industrial Statistics with Minitab
by Pere Grima Cintas, Lluis Marco Almagro, Xavier Tort-Martorell Llabres
Content preview from Industrial Statistics with Minitab
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11.4 Test for Homogeneity of Variances
Consider again the data on the comparison of phenol contents of different tree varieties. Can we affirm that there is a significant difference among the three varieties of trees with respect to the variability of phenol contents?
Stat > ANOVA > Test for Equal Variances.
The test results are summarized in the following graph:
The confidence intervals greatly overlap and the p-values of both tests are large. Therefore, it cannot be stated that the variability is different among the three varieties of trees.
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