Question 15 An economist would like to estimate the average household income in Indian River county. The mean household income of a random sample of 262 families in Indian River county was found to be $47,248. The standard deviation of the household incomes of all households in Indian River county is known to be $1, 165. Using a 96% confidence level, determine the margin of error, E, and a confidence interval for the average household income in Indian River county. Report the confidence interval using interval notation. Round solutions to two decimal places, if necessary. The margin of error is given by E A 96% confidence interval is given by Question Help: Video Submit All Parts