The data that follow are observations collected from an experiment that compared four tr...

The data that follow are observations collected from an experiment that compared four treatments, A, B, C, and D, within each of three blocks, using a randomized block design.

a. Do the data present sufficient evidence to indicate differences among the treatment means? Test using α = .05.

b. Do the data present sufficient evidence to indicate differences among the block means? Test using α = .05.

c. Rank the four treatment means using Tukey’s method of paired comparisons with α = .01.

d. Find a 95% confidence interval for the difference in means for treatments A and B.

e. Does it appear that the use of a randomized block design for this experiment was justified? Explain.