We are trying to maximise the lifetime of a particular engine by testing two different types...

We are trying to maximise the lifetime of a particular engine by testing two different types of maintenance schedule. We test Schedule A on 40 engines which leads to an average lifetime of 13.2 years with a standard deviation of 3.1. We test Schedule B on another 40 engines which leads to an average lifetime of 10.4 years with a standard deviation of 2.1. The 98.5% confidence interval for the difference in the lifetimes is given by:

A. [1.64,3.96]
B. [1.36,4.24]
C. [1.92,3.68]
D. [1.52,4.08]

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orchestra answered 1 year ago

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