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Find the number of active coal mines in utah

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Question: Physical Science The number of active coal mines in Utah has steadily decreased since 1960. However, peak production occurred in 2001.8 One measure of mine productivity is tons/employee hour. In a random sample of 40 days, the mean tons/employee hour was 4.99. Assume σ = 1.14. Find a 95% confidence interval for the true mean tons/employee hour.

Reference no: EM131747696

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