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The supervisor of a new tires manufacturing company needs to estimate the mean life (measures in miles) of all new tires the company produced. A

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The supervisor of a new tires manufacturing company needs to estimate the mean life (measures in miles) of all new tires the company produced. A random sample of new tires is taken from inventory and their mean life is measured. The average tire life in the sample is 80,000 miles, with a standard deviation of 4000 miles. The sample size was 100. The standard error in this case is

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