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ABC company is experimenting with two forecasting methods for its product. Table 2.20 gives the actual sales and the forecasts obtained by the two methods during the past 6 months.
(a) Calculate MAD, MSE, and BIAS for the two methods.
(b) Calculate and plot the tracking signals for the two methods.
(c) Are the methods under-forecasting or over-forecasting? Which method would you recommend for forecasting future sales and why?
Water flows through 800 feet of 12-inch diameter iron pipe (? = 0.0018 inches) between 2 open storage tanks, whose water surface elevation difference is 16 feet. The pipe entrance is flush and square edged
A 45 W electric mixer is operated for 5 minutes while mixing a 2 kg shake. Assume Csubv=4200 J/kg-K for the liquid. Determine the temperature rise (in degrees C) of the milk shake.
Assemble samples of as many different species of wood as you can Þ nd. Learn how to tell the different species apart by color, odor, grain Þ gure, ray structure, relative hardness, and so on.
The factor of safety is defined as the ratio of the stabilizing moment divided by the overturning moment. The densities of concrete and water are = 2.40 and = 1 , respectively. Assume that the dam does not slide.
Calculate the deflection of the column. You must choose the number of steel rods n, and the rod diameter. Exact location of roads does not need to be specified. You must also chose a thickness of the wrap.
Air at 70oF and atmospheric pressure flows with a velocity of 22 ft/s through a 3-in-diameter pipe (e = 0.00015 in). Find the friction head loss in 75 ft of pipe.
study the sources for current tuition rates and historical trends of tuition. assume that in the next 20 years tuition will change with a similar trend for all universities .
Two steel rods with fixed supports at A and C are attached by a rigid flange at point B and a downward load of 120 kN is applied to the flange. The upper rod has a cross section of 800 mm^2 and the lower rod has
A 150 L helium tank contains pure helium at a pressue of 1825 psig. How many 3.5L helium balloons can be filled from the helium in the tank? (Assume an atmospheric pressue (14.7 psia) and a temp of 298K.
Evaluate the pressure head at point a and determine the vertical effective stress at point b and evaluate the lateral pressurein the brown clay
a room is to be maintained at 72 F db. It is estimated that the inside wall surface temperature could be as low as 48 F. What maximum relative and specific humidities can be maintained without condensation on the walls
A) Aluminum ion (Al3+) is present in an industrial wastewater at 3 mg/L. The treatment facility wants to precipitate out the aluminum until there is only 0.2 mg/L remaining. What pH is required to acheive this aluminum ion concentration?
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