A soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 in.
?(a) Determine the minimum sample size required to construct a 99?% confidence interval for the population mean. Assume the population standard deviation is 0.25 in.
?(b) Repeat part? (a) using a population standard deviation of 0.40 in. Which standard deviation requires a larger sample? size? Explain.
?(Round up to the nearest? integer.)