Chapter 8 Confidence Intervals (Sample Size) Score: 0/12 0/12 answered Question 2 We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately o - 59.3. We would like to be 95% confident that the estimate is within 0.2 of the true population mean. How large of a sample size is required? n Question Help: Message instructor Submit