Confidence interval for the population mean of the shafts
A sample of 15 measurements of the diameter of a shaft gave a mean Xbar=4.38 inches and a standard deviation s=0.06 inch. Find a 95% confidence interval for the population mean of the shafts
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Measurements of the diameter of a random sample of 100 ball bearings made by a certain machine during one week showed a mean of 0.944 inch and a standard deviation of 0.052 inch. Find a 90% Confidence interval for the mean diameter of all the ball
In measuring reaction time, a human factors engineer estimates that the standard deviation is 0.20 second. How large a sample of measurements must be taken in order to be 95% confidence that the error in her estimate of the mean reaction time will
A 200mm DN pipeline has to deliver 80m³/h of water at a discharge pressure of 5,550kPa. Approximately how many pump stations would be needed for a pipeline 300km long?
The bulk modulus for bone is about 1.5*10^10Pa. If a diver-in-training is put into a pressurized suit, by how much would the pressure have to be raised (in atmospheres) above atmospheric pressure to compress her bones by 0.120% of their original v
A 4 kW motor is driving an oil pump with an efficiency of 95% down a 10 mm diameter pipe. If the velocities of the fluid down the pipe is 1.8 m/s. What is the flow rate that the pump delivers?
A truck driver used sand to soak up a 1 g spill of lindane(C6H6Cl6). He placed the contaminate soil in an open drum which then filled up with 150 L ofrain water during a rainstorm. You test the water to find a concentration of 17 M/L.
A random sample of 70 needles was taken from a medical manufacturing facility and 24 were found to be defective. Calculate a 99% confidence interval for the true proportion of defective needles.
Consider a gaseous binary compound with a molar mass of 62.09g/mol. When 1.39g of this compound is completely burned in excess oxygen, 1.21g of water is formad.
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