Twenty-seven people participated in an experiment to compare the effects of five different stimuli on reaction time. The experiment was run using a completely randomized design, and, regardless of the results of the analysis of variance, the experimenters wanted to compare stimuli A and D. The results of the experiment are given here. Use the MINITAB printout to complete the exercise.

MINITAB output for Exercise 11.56

a. Conduct an analysis of variance and test for a difference in the mean reaction times due to the five stimuli.
b. Compare stimuli A and D to see if there is a difference in mean reaction times.

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Stimulus Reaction Time (sec) Total Mean 25 625 78 .5 .5 6 9 7 4.7671 12 0 9 12 13 8 6.4067 920 480 2 1.0 9 91. 7 6 4 47 3 2 4.6 2.4 One-way ANOVA: Time versus Stimulus DF Stimulus Error Total 1.2118 0.5711 1.7830 MS 0.3030 0.0260 11.67 0.000 26 S 0.1611 R-Sq 67.97% R-Sq { adj) 62.14 = = Individual 95% CIs For Mean Based on Pooled StDev Level 0.1258 0.1496 0.1966 0.1483 5 0.4800 0.1643 --*) Mean 0.6250 0.6714 1.0667 0.9200 7 Pooled StDev0.1611 0.50 0.75 1.00 1.25