Question: In an injection molding procedure plastic parts are produced by injecting the plastic material into a mold. Some variability is experienced in the resulting weight

In an injection molding procedure plastic parts are produced by injecting the plastic material into a mold. Some variability is experienced in the resulting weight (or equivalently density) of the part. DS 14.3.1 contains the results of a two-factor experiment to investigate how the weight of the parts depends on the type of injection material and the pressure of injection.
(a) Construct the analysis of variance table.
(b) Construct pairwise confidence intervals to compare the three different types of injection material. What conclusions can you draw?
(c) Construct pairwise confidence intervals to compare the three different injection pressures. What conclusions can you draw?

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