Consider again the one-way ANOVA hypothesis test described in Problem 5. Address the multiple comparison problem by applying the Bonferroni, Tukey, and Scheffé methods to obtain an overall confidence level of approximately 95%. How do these results compare to the uncorrected 95% confidence intervals? Recall that the relevant data are given in the file AVES) DALSS,

Data from in problem 5

Although four similar-sized small-car models exhibit similar miles per gallon (mpg) sticker ratings, there is some skepticism as to whether their mean mpg values are really equal. To test this equal-means hypothesis, several cars of each model are driven for 10,000 miles under nearly identical driving conditions. The observed mpg values are listed in the file P12_5.XLS. Use one-way ANOVA to help decide whether the different models have equal mean mpg values, and write a short report to summarize your findings.