Because of different sales ability, experience, and devotion, the incomes of real estate agents vary considerably. Suppose that in a large city the annual income is normally distributed with a standard deviation of $15,000. A random sample of 16 real estate agents was asked to report their annual income (in $1,000). The responses are listed here. Determine the 99% confidence interval estimate of the mean annual income of all real estate agents in the city. 65 94 57 11 18 36 15 07 36 88 09 38 41 13 41 60 77

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