11.87 Refer to Exercise 11.86. The data that were used to fit the operations engineer’s complete and reduced models are displayed in table below.

a Use these data to test the null hypothesis that in the complete model. Test by using .

b Carefully interpret the results of the test in the context of the problem.

a = 0.10 b1 = b2 = 0

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Downtime per Month (hours) Machine Machine Age (years) 10 001 1.0 20 001 2.0 30 001 2.7 40 001 4.1 9 001 1.2 25 001 2.5 19 001 1.9 41 001 5.0 22 001 2.1 12 001 1.1 10 002 2.0 20 002 4.0 30 002 5.0 44 002 8.0 9 002 2.4 25 002 5.1 20 002 3.5 42 002 7.0 20 002 4.0 13 002 2.1