Health insurers and the federal government are both putting

Health insurers and the federal government are both putting pressure on hospitals to shorten the average length of stay (LOS) of their patients. A sample based on 16 hospitals in the United States had a mean LOS in the year 2010 of 4.5 days and a standard deviation of 1.25 days.

a. Find a 95% confidence interval for the mean LOS in 2010.

b. In the context of the problem, describe the assumptions you made in order to construct the interval in part a.

c. If the assumptions listed in b. are not really true, what can you say about the confidence level of the interval in part a.?Please explain

Solution

a)
Confidence Interval
CI = x