(Multiple Choice) A hospital administrator wants to determine a 94% confidence i

Question

(Multiple Choice) A hospital administrator wants to determine a 94% confidence interval for the mean number of days that patients stay at the hospital. The data given her by the business manager lists the stay for each patient for the previous calendar year. Which of the following is the reason the administrator cannot determine the confidence interval? A. A confidence interval should not be constructed when population data is known. B. Since most stays are just a few days long, the data is highly skewed. C. A 90% or 95% confidence interval can be computed but not a 94% confidence interval since the tables don’t show the critical values (z* and/or t*). D. Since many patients were treated in the Emergency Room and then released, their stay would be zero days. This cannot be factored into the confidence interval. E. Some patients may have been treated at the hospital more than once which invalidates the independence requirement for a confidence interval.

Explanation / Answer

Solution:

A. A confidence interval should not be constructed when population data is known.

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