Hepatic g-glutamyl transpeptidase (GGTP) activity was measured in 22 patients undergoing percutaneous liver biopsy. The results were as follows:

Subject Diagnosis Hepatic GGTP Level 1 Normal liver 27.7 2 Primary biliary cirrhosis 45.9 3 Alcoholic liver disease 85.3 4 Primary biliary cirrhosis 39.0 5 Normal liver 25.8 6 Persistent hepatitis 39.6 7 Chronic active hepatitis 41.8 8 Alcoholic liver disease 64.1 9 Persistent hepatitis 41.1 10 Persistent hepatitis 35.3 11 Alcoholic liver disease 71.5 12 Primary biliary cirrhosis 40.9 13 Normal liver 38.1 14 Primary biliary cirrhosis 40.4 15 Primary biliary cirrhosis 34.0 16 Alcoholic liver disease 74.4 17 Alcoholic liver disease 78.2 18 Persistent hepatitis 32.6 19 Chronic active hepatitis 46.3 20 Normal liver 39.6 21 Chronic active hepatitis 52.7 22 Chronic active hepatitis 57.2 Can we conclude from these sample data that the average population GGTP level differs among the five diagnostic groups? Let a ¼ :05 and find the p value.