Estimate sd for population of waiting times
McDonalds Waiting Times. You want to estimate SD for the population of waiting times at McDonald's drive up windows. You want to be 95% confident that the sample SD is within 20% of SD. Find the minimum sample size. Is this sample size practical?
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A scale is constructed using the 10 kg mass, the 2 kg pan P, and the pulley and cord arrangment. Cord BCA is 2m long. If s = .75 m, determine the mass D in the pan. Neglect the size of the pulley.
The typical amount of sleep per night for undergraduate college students has a bell shaped distribution with a mean of 6 and a standard deviation of 1.60 hours.
The width of the intersection is 25.0 m. The plane decelerates through the intersection at a rate of 6.3 m/s2 and clears it with a final speed of 47 m/s. How much time is needed for the plane to clear the intersection?
Determine the power used by the pumps, the power produced by the cycle, the rate of heat transfer in the re-heater, and the thermal efficiency of the system.
What is the internal energy change of a gas gives off 312 of heat while being compress 862mL by a pressure of 1.64 bar? What are internal energy change in surrounding and universe for the process?
A point charge Q is placed at the origin. A second charge, 2Q, is placed on the x axis at x = -3.0 m. If Q = 50 μC, what is the magnitude of the electrostatic force on a third point charge, -Q, placed on the y axis at y = +4.0 m?
Air at 358C, 1 atm, and 50% relative humidity enters a dehumidifier operating at steady state. Determine the heat transfer from the moist air, in kJ per kg of dry air.
The standard free energy of activation of a reaction A is 77.7 kJ mol-1 (18.6 kcal mol-1) at 298 K. Reaction B is one million times faster than reaction A at the same temperature.
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