Lifetime of two different brands of car batteries

Reference no: EM131002688

1. The owner of a ?eet of taxi cabs wants to determine if there is a difference in the lifetime of two different brands of car batteries used in the ?eet of cabs. State the appropriate null and alternative hypotheses.

2. The safety coordinator of a manufacturing facility wishes to demonstrate that the mean time (in days) between safety incidents has deteriorated from the traditional 30 days. What are the appropriate null and alternative hypotheses?

Reference no: EM131002688

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