For a study of the hardness of gold dental fillings, five randomly chosen dentists were assigned combinations of three methods of condensation and two types of gold. The hardness was measured. [See Hoaglin, Mosteller, and Tukey’s (1991)] The data are presented here. Let the dentists play the role of blocks.,(a) State the appropriate model with the assumptions.,(b) Is there a significant interaction between method of condensation and type of gold filling material?,(c) Is there one method of condensation that seems to be best?Explain.

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