In a random sample of 40 days the mean tonsemployee hour


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.

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Basic Statistics: In a random sample of 40 days the mean tonsemployee hour
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