An experiment to determine the effect of mold temperature on tensile strength involved three different alloys and five different mold temperatures. Four specimens of each alloy were cast at each mold temperature.The results of the ANOVA are summarized in the following table. Take a = 0.01. Interpret the P-value of the ANOVA F test.

Source DF SS MS F P

Mold Temp 4 69738 17434.5 6.7724 0.000

Alloy 2 8958 4479.0 1.7399 0.187

Interaction 8 7275 909.38 0.35325 0.939

Error 25 115845 2574.3

Total 59 210816

a.Some of the main effects of mold temperature are nonzero at a = 0.01.

b.Nothing can be said at a = 0.01.

c.Some of the main effects of alloy are nonzero at a = 0.01.

d.Some of the interaction effects are nonzero at a = 0.01.