Health insurers and the federal government are both putting pressure on hospitals to shorten the average length of stay (LOS) of their patients. In 1996, the average LOS for non-heart patients was 4.6 days. A random sample of 20 hospitals in one state had a mean LOS for non-heart patients in 2000 of 3.8 days and a standard deviation of 1.2 days. Calculate a 95 percent confidence interval for the population mean LOS for non-heart patients in these hospitals in 2000.

[3.27, 4.33]

[3.34, 4.26]

[3.67, 3.93]

[3.38, 4.22]

[3.24, 4.36]