#12

Suppose your boss wants you to obtain a sample to estimate a population mean. Based on previous analyses, you estimate that 66 is the approximate value of the population standard deviation. You would Like to be 99.9% confident that your estimate is within 3? of the true population mean. What is the minimum sample size required? IMPORTANT: Use a oritical value that you found with your calculator {not from a table], and round it to 3_plar.es after the decimal point before you plug it into a formula and perform your calculations. Do not round-off any other intermediate results. n