Several ovens in a metal working shop are used to heat metal specimens. All the ovens are supposed to operate at the same temperature, although it is suspected that this may not be true. Three ovens are selected at random and their temperatures on successive heats are noted. The data collected are as follows: 

 

(a) Is there significant variation in temperature between ovens? Use α = 0.05.

(b) Estimate the components of variance for this model.

(c) Analyze the residuals from this experiment and draw conclusions about model adequacy.

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Oven Temperature 491.50 498.30 498.10 493.50 493.60 488.50 484.65 479.90 477.35 490.10 484.80 488.25 473.00 471.85 478.65 12 3