Question: A company that produces electronic ignition systems for an engine developer wants to select a suitable sample size for monitoring the mean defect-free life of

A company that produces electronic ignition systems for an engine developer wants to select a suitable sample size for monitoring the mean defect-free life of the ignition systems. The company wants to be 95% confident that the true mean life of these systems will be estimated within 6300 hours. A test study of these ignition systems provided the data that s = 1600 hours. How large must the sample size be to be 95% confident of the true mean?

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