To compare two different diets, call them A and B, volunteers followed each diet for 6 months and their weight losses were recorded. Among the 4 subjects who followed diet

A, the mean weight loss was 3 lb with a standard deviation of 1 Ib. Among the 2 subjects who followed diet B, the mean weight loss was 5 Ibs with a standard deviation of 2 lb.Assuming both populations have the same variance. Find a two-sided 95% confidence intervals of the difference of the population means.