The management of Regional Hospital has made substantial improvements in their hospital and would like to test and determine whether there has been a significant decrease in the average length of stay of their patients in their hospital. The following data has been accumulated from before and after the improvements. At 95% confidence, test to determine if there has been a significant reduction in the average length of stay. Sample size after 45, before 58
mean 4.6 after, before 4.9
standard deviation after 0.5, before 0.6
a. formulate the hypothesis. b. compute the test statistics. c. using the p value approach test to see if the average length of stay in RFH is significantly less than average stay in GH, let α=0.05