A soccer ball manufacturer wants to estimate the mean circumference of minisoccer balls within 0.15 inch. Assume
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Question:
A soccer ball manufacturer wants to estimate the mean circumference of mini‐soccer balls within 0.15 inch. Assume that the population of circumferences is normally distributed.
(a) Determine the minimum sample size required to construct a 99% confidence interval for the population mean. Assume the population standard deviation is 0.20 inch.
(b) Repeat part (a) using a standard deviation of 0.10 inch. Which standard deviation requires a larger sample size? Explain.
(c) Repeat part (a) using a confidence level of 95%. Which level of confidence requires a larger sample size?
Explain.
Related Book For
Elementary Statistics Picturing the World
ISBN: 978-0321911216
6th edition
Authors: Ron Larson, Betsy Farber
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