Answer Happy

A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are 60,139.7 and 3726.66 kilometers. Can you conclude, using a = 0.05, that the standard deviation of tire life is less than 4000 kilometers? There is ✓ sufficient evidence to indicate the true standard deviation of tire life is less than 4000 km at a = 0.05. State bounds for the P-value of this test. O 0.1 < P-value < 0.5 O 0.01 < P-value < 0.05 O 0.7 < P-value < 0.9 O 0.001 < P-value < 0.005