You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately a = 42.2. You would like to be 94% confident that your esimate is within 3.2 of the true population mean. How large of a sample size is required? Do not round midcalculation. However, use a critical 2 value rounded to two (2) decimal places. ML: Question Help: El Video Check