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statistics A recent study of 20 city residents showed that the mean of the time they had lived at their present address was 9.3 years.

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A recent study of 20 city residents showed that the mean of the time they had lived at their present address was 9.3 years. The standard deviation of the sample was 2 years. Find the 90% confidence interval of the true mean. Assume the population follows a normal distribution

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