You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 28.7. You would like to be 92% confident that your esimate is within 1.5 of the true population mean. How large of a sample size is required? Do not round mid-calculation. However, use a critical z value accurate to two (2) decimal places. n= 1121 X Hint: You appear to have rounded DOWN! or failed to round z to 2 decimal places