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?
Twelve different video games showing substance use were observed and the duration times of game play in seconds are listed below. The design of the study justifies the assumption taht the sample can be treated as a simple random sample. Use the da
Determine the diameter of the standard commercial steel pipe that will give the required performance. include the minor losses. an initial guess for the pipe size of 5 cm can be used.
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Calculate the z-test for sample = 100, sample mean = 3.4, population mean = 3.67 and standard deviation of 0.7.
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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