In a follow-up experiment, we have been able to collect data on several samples of each of Alloy A and B at 3 different temperature excursions (25 C, 80 C and 135 C) during thermal cycling. The Mean Time to Failure (MTTF) results are shown in the table below:

Alloy	25 C	80 C	135 C
A
Sample 1	4000 hours	2500 hours	1000 hours
Sample 2	4200 hours	2900 hours	1650 hours
Sample 3	3740 hours	2310 hours	950 hours
B
Sample 1	3850 hours	2350 hours	875 hours
Sample 2	3960 hours	2470 hours	1075 hours
Sample 3	3740 hours	2200 hours	810 hours

(a) Using Excels ANOVA tool (With Replication), determine which factors are significant.

(b) Draw the Mean Effects graphs to confirm that the interaction between alloy type and temperature is not significant.

(c) Use Excels Regression tool to derive the equation linking MTTF with the test variables. Because of part (b), exclude the interaction variable in the linking equation.

(d) Determine the goodness of the linear fit.