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**Hospital length of stay.** Health insurers and the federal government are both putting pressure on hospitals to shorten the average length of stay (LOS) of their patients. The average LOS in the United States is $4.5$ days (Healthcare Cost and Utilization Project Statistical Brief, October 2014). A random sample of 20 hospitals in one state had a mean LOS of $3.8$ days and a standard deviation of $1.2$ days. What is meant by the phrase "90% confidence interval"?

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VerifiedAnswered 1 year ago

Answered 1 year ago

Step 1

1 of 2We need to determine the meaning of "90% confident".

"90% confident" means that 90% of all possible samples have a 90% confidence interval that constrains the true value of the populating mean.

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