The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size of
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The manager of a pizza chain in Albuquerque, New Mexico, wants to determine the average size of their advertised 16-inch pizzas. She takes a random sample of 25 pizzas and records their mean and standard deviation as 16.10 and 1.8 inches, respectively. She subsequently computes a 95%
confidence interval of the mean size of all pizzas as [15.36, 16.84], However, she finds this interval to be too broad to implement quality control and decides to re-estimate the mean based on a bigger sample. Using the standard deviation estimate of 1.8 from her earlier analysis, how large a sample must she take if she wants the margin of error to be under 0.5 inch? P-69
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Related Book For
Business Statistics Communicating With Numbers
ISBN: 9780071317610
1st Edition
Authors: Kelly Jaggia
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