Artificial human joints are usually secured with acrylic bone cement. The following data on the force (in Newtons) required to break an acrylic cement bond under different temperatures and media is consistent with the information in the article “Validation of Small-Punch Test as a Technique for Characterizing the Mechanical Properties of Acrylic Bone Cement” (J. Engr. Med. 2006: 11–21):

a. Identify the factors, levels, and treatments in this experiment.
b. Create an interaction plot using the breaking force data, and comment on what you see.
c. Test for the presence of main and interaction effects at the α = .05 level. Are the results consistent with the interaction plot?

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Temp. (°C) 22 37 22 37 Medium Dry Dry Wet Wet Breaking force data (N) 100.8, 141.9, 194.8, 118.4, 176.1, 213.1 302.1, 339.2, 288.8, 306.8, 305.2, 327.5 385.3, 368.3, 322.6, 307.4, 357.9, 321.4 363.5, 377.7, 327.7, 331.9, 338.1, 394.6