1. Trauma and Metabolic Expenditure. Use a statistical computer package to verify the rank-sum and the Z-statistic obtained in Exercise 20. Is the p-value the same? (Does the statistical package use a continuity correction?)

2. Trauma and Metabolic Expenditure. Using the rank-sum procedure, find a 95% confidence interval for the difference in population medians: the median metabolic expenditure for the popu- lation of trauma patients minus the median metabolic expenditure for the population of nontrauma patients.