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]

---

Definitions:

Medicare Fee-for-service

A payment model under Medicare where providers are paid for each service they render, including tests, surgeries, and other procedures.

Medigap Insurance

Supplemental insurance that covers costs not covered by Medicare, such as copayments, coinsurance, and deductibles.

Allowable Charge

The maximum amount a health plan or insurance pays for a covered healthcare service, also known as the approved, eligible, or allowed amount.