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over the past 5 years (n=60 months), the average monthly returns for AA stock were 1.01% with a standard deviation of 10.61%. Assuming that returns
over the past 5 years (n=60 months), the average monthly returns for AA stock were 1.01% with a standard deviation of 10.61%. Assuming that returns are normally distributed and that the empirical estimates of the mean ad variance are unbiased estimates of next month's mean and variance, construct the 90% confidence interval for next month's return
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