The investigator mentioned in Review Question 14.14 wishes to conduct a more extensive test of the effect of alcohol consumption on the performance of automobile drivers, possibly to gain more information about the legal maximum for DUI arrests. Before the driving test, subjects drink a glass of orange juice laced with controlled amounts of vodka. Their performance is measured by the number of errors on a driving simulator.
Five subjects are randomly assigned to each of five groups receiving different amounts of vodka (either 0, 1, 2, 4, or 6 ounces), and the following results were obtained:
(a) Summarize the results with an ANOVA table.
(b) If appropriate, estimate the effect size with n2.
(c) If appropriate, use Tukey’s HSD test to pinpoint pairs of means that contribute to the significant F, given that 0 = 3, 1 = 4, 2 = 5.2, 4 = 11.2 and 6 = 14.8. Furthermore, if appropriate, estimate effect sizes with Cohen’s d.

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