# An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. Suppose that the mean income is found to be $31.7 for a random sample of 753 people. Assume the population standard deviation is known to be$9. Construct the 80% confidence interval for the mean per capita income in thousands of dollars. Round your answers to one decimal place.

Question

An economist wants to estimate the mean per capita income (in thousands of dollars) for a major city in Texas. Suppose that the mean income is found to be $31.7 for a random sample of 753 people. Assume the population standard deviation is known to be$9. Construct the 80% confidence interval for the mean per capita income in thousands of dollars. Round your answers to one decimal place.