An experiment was run to determine whether four specific firing temperatures affect me 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 α = 0.05.

(b) Is it appropriate to compare the means using Duncan's multiple range test (for ex-ample) in this experiment?

(c) Analyze the residuals from this experiment. Are the analysis of variance assumptions satisfied?

(d) Construct a graphical display of the treatment as described in Section 3-5.3. Does this graph adequately summarize the results of the analysis of variance in part (a)?

Transcribed Image Text:

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