The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right. Complete parts (a) through (c) below. Assume the population is normally distributed. (a) Find the sample mean. X = (Round to one decimal place as needed.) (b) Find the sample standard deviation. =(Round to one decimal place as needed.) (c) Construct a 99% confidence interval for the population mean μ. S= A 99% confidence interval for the population mean is (). (Round to one decimal place as needed.) 4450.37 4596.48 4366.27 4455.17 4151.81 3727.41 4283.68 4527.97 4407.84 3946.34 4023.22 4221.52 n

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