11.57 Reaction Times II The experiment in Exercise 11.54 might have been conducted more effectively using a randomized block design with people as blocks, since you would expect mean reac- tion time to vary from one person to another. Hence, four people were used in a new experiment, and each person was subjected to each of the five stimuli in a random order. The reaction times (in seconds) are listed here:

a. Use the MINITAB printout to analyze the data and test for differences in treatment means.

b. Use Tukey's method for paired comparisons to iden- tify the significant pairwise differences in the stimuli.

c. Does it appear that blocking was effective in this experiment?

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Stimulus Subject A A B C D E 0.7 0.8 1.0 1.0 0.5 - 23 0.6 0.6 1.1 1.0 0.6 0.9 1.0 1.2 1.1 0.6 4 0.6 0.8 0.9 1.0 0.4