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Question: the data that follow are observations collected from an experiment...

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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.

Block A B C D Total
1 6 10 8 9 33
2 4 9 5 7 25
3 12 15 14 14 55
Total 22 34 30 30 113


a. Do the data present sufficient evidence to indicate differences among the treatment means? Test using alpha = 0.05.

b. Do the data present sufficient evidence to indicate differences among the block means? Test using alpha = 0.05.

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

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