An electric car manufacturer underestimatedthe January sales of car by 20 units, while theactual sales was 120 units. If themanufacturer uses exponential smoothingmethod with a smoothing constant of a = 0.2,then the sales forecast for the month ofFebruary of the same year is

Given data; An electric car manufacturer underestimated the, January sales of car=20 units Actual…

Answered: he sales forecast for the month of

Engineering

Mechanical Engineering

he sales forecast for the month of

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.18P: The drag on an airplane wing in flight is known to be a function of the density of air (), the...

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Forecast sales for the 7th period. For leveling, use exponential smoothing 0.20 and moving average 3 for averaging; and linear and exponential functions for trend data. Assume an initial exponential forecast of 60 units in period 2 if you decide to use it (i.e., no forecast for period 1). Period Demand 1 67 2 72 3 68 4 20 5 70 6 66 7 68
We are using simple exponential smoothing to predictmonthly electric shaver sales at Hook’s Drug Store. At theend of October 2006, our forecast for December 2006 saleswas 40. In November 50 shavers were sold, and duringDecember 45 shavers were sold. Suppose a 0.50. At theend of December, 2006, what is our prediction for the totalnumber of shavers that will be sold during March and Aprilof 2007?
From the following test data estimate the values of Ks and Kefor the filter drag model. Limestone dust loading = 1.0g/m3 Fabric area = 1.00m2 Air flow rate = 0.8m3/min Time min 5 10 15 20 25 30 Filter ∆P, Pa 330 490 550 600 640 700 Give your answers in units of (Pa-min-m)/g and (Pa-min)/m respectively
The speed of sound traveling through the sea is a function of temperature, salinity, and pressure. It is modeled by the function C = 1449.2 + 4.67T -0.055T² +0.00029T³ + (1.34-0.01T) (S-35) + 0.016D where C is the speed of sound (in meters per second), T is the temperature (in degrees Celsius), S is the salinity (the concentration of salts in parts per thousand, which means grams of dissolved solids per 1000 grams of water), and D is the depth below the sea surface, in meters. Calculate the following (Check attached image d3) when T = 10 °C, S = 35 parts per thousand, and D = 100 m. Explain the physical meaning of these derivatives.
A special case of a linear function occurs when we talk about direct variation. If the quantities x and y are related by an equation y − kx for some constant k ± 0, we say that y varies directly as x, or y is proportional to x. The constant k is called the constant of proportionality. Equivalently, we can write fsxd − kx, where f is a linear function whose graph has slope k and y-intercept 0. (a) As dry air moves upward, it expands and cools. If the ground temperature is 20°C and the temperature at a height of 1 km is 10°C, express the temperature T (in °C) as a function of the height h (in kilometers), assuming that a linear model is appropriate. (b) Draw the graph of the function in part (a). What does the slope represent?(c) What is the temperature at a height of 2.5 km?
the following data is obtained for the velocity of a vehicle during a crash test: t(ms) v(mph) 0 30 10 29.5 20 28 30 23 40 10 50 5 60 2 70 0.5 80 0 if the vehicle's weight is 2,400 lb, approximate the force f in lb acting on the vehicle 40ms after the crash. the force can be calculated by F=m(dv/dt) , and the mass of the car m is 2400/32.2 slug. note that 1 ms=10^-3 s and 1 mile = 5,280 ft. convert t to secons and mph to fps. use 1st order forward, backward, and centered difference and apply Richardson's approximation. use h1=0.02 and h2-0.01s.Show detailed solution. Thanks!
When using the method of repeated variables in a problem, it is determined that one of the independent Πs is given by the product between the independent variable lift force FL [N], and the repeated variables density ρ [kg/m3], velocity V [m/s], and area A [m2]. Remembering that Πs are given by the product of the primary dimensions raised to the zero power, of the type m0L0t0 T0, determine this independent Π. (the form is in the side picture)
An airplane builder wants to build a scaled-down model of a real airplane in a 12:1 ratio in order to be able to perform tests in a wind tunnel. The real plane flies at 126 km/h, while the air speed in the tunnel where the model is located is given by V. The performances of the two will be equivalent for a value of V, in m/s, equal to Data: air viscosity η = 1.8 × 10-5 kg/(m.s) air density ρ = 1.3 kg/m3
When is the exponential smoothing model equivalent to the naïve forecasting model? Select one: a. alpha= 0.5 b. alpha = 0 c. alpha=1 d. alpha= 5
An automotive engineer is testing how quickly a newly designed sports car accelerates from rest. He has collected data giving the velocity V, in miles per hour, as a function of time t, in seconds, since the car was at rest. Below is a table giving a portion of his data. Time (t) Velocity (V) 2.0 28.4 2.5 33.9 3.0 39.4 3.5 44.9 (a) By calculating differences, show that the data in this table can be modeled by a linear function. Time 2.0 to 2.5 2.5 to 3.0 3.0 to 3.5 Change in t Change in V (b) What is the slope for the linear function modeling velocity as a function of time? mph per secExplain in practical terms the meaning of the slope. This means that, after every second, the car will be going miles per hour faster. This says that the acceleration is ---Select--- varying constant . (c) Use the data in the table to find the formula for velocity V as a linear function of time t that is valid over the time period covered in the table.V =…
Problem statement : A simple flow-measurement device for streams and channels is a notch, of angle α, cut into the side of a dam, as shown in Fig. P5.69. The volume flow Q depends only on α, the acceleration of gravity g, and the height δ of the upstream water surface above the notch vertex. Tests of a model notch, of angle α = 55°, yield the following flow rate data: δ, cm: 10 20 30 40 Q, m3/h: 8 47 126 263 Part (A) - Find a dimensionless correlation for the data. (b) Use the model data to predict the flow rate of a prototype notch, also of angle α = 55°, when the upstream height δ is 3.2 m.
The population P in thousands of Tallahassee, Florida, from 2000 through 2014 can be modeled by P = 150.9ekt, where t represents the year, with t = 0 corresponding to 2000. In 2005, the population of Tallahassee was about 163,075.(a) Find the value of k. Is the population increasing or decreasing? Explain. (b) Use the model to predict the populations of Tallahassee in 2020 and 2025. Are the results reasonable? Explain. (c) According to the model, during what year will the population reach 200,000?