A manufacturer of car batteries needs to estimate the, Basic Statistics

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A manufacturer of car batteries needs to estimate the

A manufacturer of car batteries needs to estimate the average life of its batteries. Prior data indicate that the standard deviation of the population of batteries is approximately eight months. What size sample is necessary if the manufacturer wants to estimate the true average life of its car batteries within two months with 90% confidence?

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Basic Statistics: A manufacturer of car batteries needs to estimate the

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Basic Statistics: A manufacturer of car batteries needs to estimate the

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