Heat treating of metal parts is a widely used manufacturing process. An article in the Journal of Metals (Vol. 41, 1989) describes an experiment to investigate flatness distortion from heat treating for three types of gears and two heattreating times. Some of the data are as follows.

 

 

(a) Is there any evidence that flatness distortion is different for the different gear types? Is there any indication that heat-treating time affects the flatness distortion? Do these factors interact? Use  α = 0.05.

(b) Construct graphs of the factor effects that aid in drawing conclusions from this experiment.

(c) Analyze the residuals from this experiment. Comment on the validity of the underlying assumptions.

 

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