Refer to Exercise 15.16.
a. Which pairs of varieties appear to have significantly different mean yields at the α = .05 level?
b. Which pairs of planting densities appear to have significantly different mean yields at the α = .05 level?
c. Which variety appears to produce the largest mean yield?
d. Which planting density appears to produce the largest mean yield?
e. Explain what aspect of your model allows you to answer part (c) without referring to planting density?
In exercise

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Variety Sunbeam Celebrity Trust Density Density Density 20k 35k Field 5k 50k 5k 20k 35k 50k 5k 20k 35k 50k 32.5 39.9 42.5 38,2 33.4 47.2 44.5 43.5 411 48.7 53.5 48.4 32.2 43.2 47.6 43.5 33.4 51.3 52.244.1 418 512 55.955.9 49.9 59,0 66.3 58.3 60.8 66 70.7 60.6 60.8 67.6 73.2 67.8