A randomized block design was used to compare the mean responses for three treatments. Four blocks of three homogeneous experimental units were selected, and each treatment was randomly assigned to one experimental unit within each block. The data are shown below, followed by a StatCrunch ANOVA printout for this experiment.

b. Do the data provide sufficient evidence to indicate that the treatment means differ? Use α = .05.

c. Do the data provide sufficient evidence to indicate that blocking was effective in reducing the experimental error? Use α = .05.

d. Use the printout to rank the treatment means at α = .05.

e. What assumptions are necessary to ensure the validity of the inferences made in parts b, c, and d?

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Treatment A B C 1 3.4 4.4 2.2 2 5.5 5.8 3.4 553 Block 3 7.9 9.6 6.9 4 1.3 2.8 .3