Question: A study was made to determine if humidity conditions have an effect on the force required to pull apart pieces of glued plastic. Three types

A study was made to determine if humidity conditions have an effect on the force required to pull apart pieces of glued plastic. Three types of plastic were tested using 4 different levels of humidity. The results, in kilograms, are as follows:

1. Assuming a fixed effects experiment, perform an analysis of variance and test the hypothesis of no interaction between humidity and plastic type at the 0.05 level of significance.

2. Using only plastics A and B and the value of s from part (a), once again test for the presence of interaction at the 0.05 level of significance.

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