The data from Schecter et al deal with sodium chloride preference as related to hypertension. Two groups, 12 normal and 10 hypertensive subjects, were isolated for a week and compared with respect to N a+ intake. The average daily N a+ intakes are provided in sodium.txt dataset. Compare the average daily N a+ intake of the hypertensive subjects with that of the normal volunteers using the Wilcoxon rank sum test at the 5% significance level. (Note: you can use R or SAS to solve this problem.)

"Na" "Group" 10.2 Normal 2.2 Normal 0 Normal 2.6 Normal 0.5 Normal 43.1 Normal 45.8 Normal 63.6 Normal 1.8 Normal 1 Normal 3.7 Normal 2 Normal 92.8 Hypert 54.8 Hypert 51.6 Hypert 61.7 Hypert 250.8 Hypert 84.5 Hypert 34.7 Hypert 62.2 Hypert 11 Hypert 39.1 Hypert