Refer to the serum angiotensin-converting enzyme data on 1600 subjects (SACEDATA).

Sarcoidosis, found throughout the world, is a systemic granulomatous disease of unknown cause. The assay of serum angiotensin-converting enzyme (SACE) is helpful in the diagnosis of active sarcoidosis. The activity of SACE is usually increased in patients with the disease, while normal levels occur in subjects who have not had the disease, those who have recovered, and patients with other granulomatous disorders. The data are the SACE values for four populations of subjects classified according to status regarding sarcoidosis: never had, A; active, B; stable, C;

recovered, D. Select a simple random sample of 15 subjects from each population and perform an analysis to determine if you can conclude that the population means are different. Let a ¼ :05.

Use Tukey’s test to test for significant differences among individual pairs of means. Prepare a written report on your findings. Compare your results with those of your classmates.