You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=44.7. You would like to be 95% confident that your esimate is within 0.2 of the true population mean. How large of a sample size required? n= Do not round mid-calculation. However, use a critical value accurate to three decimal places - th is important for the system to be able to give hints for incorrect answers.