Three groups of 15, 15, and 13 participants are each given a different dose of alcohol. The control group, with 12 participants, is given no alcohol. Participants in all groups are then given a simulated driving test and their reaction time for applying the brakes at red lights is measured and recorded. ANOVA is run and the null is rejected. To find out if the average performance of Groups 1 and 2 differed significantly from Group 3, which post hoc test should be run?

a. two t-tests
b. Scheffe test
c. Tukey test
d. planned comparisons
e. It is inappropriate to run further tests because p < .01.


Ans: b

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