An experiment was performed to determine whether the annealing temperature of ductile iron affects its tensile strength. Five specimens were annealed at each of four temperatures. The tensile strength (in ksi) was measured for each. The results are presented in the following table.

a. Construct an ANOVA table. You may give a range for the P-value.
b. Can you conclude that there are differences among the mean strengths?

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Temperature (C) Sample Values 750 800 850 900 19.72 20.88 19.63 18.68 17.89 16.01 20.04 18.10 20.28 20.53 16.66 17.38 14.49 18.21 15.58 16.93 14.49 16.15 15.53 13.25