Suppose that a random sample of 15 recently sold houses in a certain city has a mean sales price of $300,000, with a standard deviation of $11,000. Under the assumption that house prices are normally distributed, find a 95% confidence interval for the mean sales price of all houses in this city. Give the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to the nearest whole number. (If necessary, consult a list of formulas.) Lower limit: s Upper limit: s X

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