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7 Dec
2020

Interaction detection

Category:ACADEMICIAN

SOLUTION AT Australian Expert Writers

1. For the additive model (9.5.1), show that the mean profile plots are parallel. The sample mean profile plots are given by plotting 
These offer a graphical diagnostic for interaction detection. Obtain these plots for the last exercise.
2. We wish to compare compressive strengths of concrete corresponding to a = 3 different drying methods (treatments). Concrete is mixed in batches that are just large enough to produce three cylinders. Although care is taken to achieve uniformity, we expect some variability among the b = 5 batches used to obtain the following compressive strengths. (There is little reason to suspect interaction, and hence only one observation is taken in each cell.) Data are also in the data set sec95set2.rda.

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