A Bank Is Trying to Determine Which Model of Safe

question 22

Multiple Choice

A bank is trying to determine which model of safe to install.The bank manager believes that each model is equally resistant to safe crackers but sets up a test to be sure.He hires nine safe experts to break into each of the models,timing each endeavor.The results (in seconds) are given next,paired by expert.Let D be the difference: Time to break Safe 1 minus Time to break Safe 2. Assuming the difference D is normally distributed,which of the following is the 95% confidence interval for μ_D?

• A) [-1.7537,5.7537]
• B) [-1.1459,5.1459]
• C) [-0.6739,4.6739]
• D) [-0.5368,4.5368]

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