Chapter 8 Confidence Intervals (Sample Size) Score: 0/12 0/12 answered Question 3 You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 64.5. You would like to be 90% confident that your estimate is within 4 of the true population mean. How large of a sample size is required? Do not round mid-calculation. n= Question Help: Message instructor Submit