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At a hospital, a sample of 16 individuals with Down's syndrome yielded a mean of 6.5 mg/100ml, and a sample of 18 normal individuals of the same sex and age were found to have a mean value of 4.7 mg/100ml. If it is reasonable to assume that the two populations are normally distributed with variances equal to 3.61 and 1.96, respectively, find the 95% confidence interval for u1-u2.

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