How many integrated circuits must be randomly selected and tested for time to failure in order to

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How many integrated circuits must be randomly selected and tested for time to failure in order to estimate the mean time to failure? We want 95% confidence that the sample mean is within 2 hr of the population mean, and the population standard deviation is known to be 18.6 hours.

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Elementary Statistics

ISBN: 9780321500243

11th Edition

Authors: Mario F. Triola

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