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6 . Sample size for an interval estimate of a population mean The Council of Economic Advisers (CEA) is conducting a study to estimate the average earned income tax credit (EITC) for households who receive a credit. The project manager desires a $150 bound on the error of estimation at 95% confidence. The population standard deviation is unknown, and a "best guess" of $1,178.75 is used as the planning value for o. Use the Distributions tool to help you answer the questions that follow. Select a Distribution Distributions 0 1 2 3 The z-value for a 95% confidence interval of the population mean is In order to satisfy the requirement of a $150 bound on the error of estimation, a sample size no smaller than is needed