Find confidence interval for true mean

Reference no: EM131430902

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: EM131430902

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