Confidence interval for estimating the population mean
Salaries of 40 college graduates who took a statistics course in college have a mean of $62, 200. Assuming a standard deviation of $11,766 construct a 90% confidence interval for estimating the population mean.
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If the boiler has an efficiency of 85% and burns natural gas with a heating value of 100,000 btu/therm at a cost of $1.25/therm, what does it cost to provide natural gas to this plant in $/hr?
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The specific gravity of the solid particles is 2.7. For this sample, determine the water content, void ratio, porosity and total unit weight.
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