Exercise 20 described an exper

Exercise 20 described an experiment involving three processing parameters: laser power (A), scanning velocity (B), and powder flow rate (C). Another experiment considered how depth penetration of the cladding layer is affected by these same factors. Each factor had three levels and there was one observation at each factor combination. Here is the ANOVA table from the article, which only considered main effects and two-factor interactions:

a. Fill in the missing entries in the table.

b. Identify significant effects using ­ ­ .01

Exercise 20

The deposition of thick protective coatings on substrates can be facilitated by laser cladding, in which an alloy powder is melted on the substrate surface. Experiments were conducted to determine how three processing parameters, laser power (A), scanning velocity (B), and powder flow rate (C) affect the coating hardness. (“Laser Cladding: An Experimental Study of Geometric Form and Hardness of Coating Using Statistical Analysis,” J. of Engr. Manuf., 2006: 1549–1554). Each factor had three levels, and there was one observation at each factorlevel combination. The following corresponds to the ANOVA table from the article; only main effects and two-factor interactions were considered there:

a. Fill in the missing entries in the table.

b. Identify significant effects using   .01.

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