An experiment was run to determine whether four specific firing temperatures affect the density of a certain type of brick. The experiment led to the following data.

(a) Does the firing temperature affect the density of the bricks? Use a = 0.05.
(b) Find the P-value for the F-statistic computed in part (a).
(c) Analyze the residuals from the experiment.

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Temperature (CF) Density 21.8 21.9 21.7 21.6 21.7 21.5 21.7 21.4 21.5 21.5 21.9 21.8 21.8 21.6 21.5 21.7 100 125 21.8 150 21.8 21.7 21.6 21.8 175 21.9