Study of inflamed ear lobes. In a Journal of Ethnopharmacology (June 1995) study, mice with inflamed ear lobes were randomly divided into two groups; one group was treated with bear bile while the other was treated with normal saline. Assuming equal-sized groups, how many mice should be included in each group in order to estimate the difference in the mean degree of swelling to within 2 milligrams with 95% confidence? Use the fact that the degree of swelling standard deviations for the bear bile and normal saline groups are approximately 4 milligrams and 3 milligrams, respectively.
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