Question
A company producing light bulbs wishes to estimate the true mean life of its product. Prior sampling has revealed a standard deviation of 12 hours.
A company producing light bulbs wishes to estimate the true mean life of its product. Prior sampling has revealed a standard deviation of 12 hours. How many bulbs must be sampled if the company personnel want the true mean life estimated accurately to within 4 hours with a 95% level of confidence?
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Practical Linear Algebra A Geometry Toolbox
Authors: Gerald Farin, Dianne Hansford
3rd Edition
1466579587, 9781466579583
