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A soccer ball manufacturer wants to estimate the mean circumference of soccer balls within 0.1 inch.
(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 inch.
(b) Repeat part (a) using a population standard deviation of 0.3 inch.
(c) Which standard deviation requires a larger sample size? Explain. |
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