HW 4 Solutions - Homework 4 BUSQOM 1070, Spring 2011...

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Homework 4 BUSQOM 1070, Spring 2011 Assigned: Monday, February 14, 2011 Due: Monday, February 21, 2011 From Chapter 4 (pages 143 – 144) in Heizer/Render 10 th Edition: Problem 4.28 Add part B: Assume the annual demand is 550 thousand guests. What is the forecast for winter, spring, summer and fall 2010? 4.28 Quarter 2005 2006 2007 Average Demand Average Quarterly Demand Seasonal Index Winter 73 65 89 75.67 106.67 0.709 Spring 104 82 146 110.67 106.67 1.037 Summer 168 124 205 165.67 106.67 1.553 Fall 74 52 98 74.67 106.67 0.700 Problem 4.32 Calculate the regression coefficients a and b by using the formulas. Do not use software that automatically gives the solution. 4.32 (a) x y xy x2 16 330 5,280 256 12 270 3,240 144 18 380 6,840 324 14 300 4,200 196 60 1,280 19,560 920 2 2 2 60 15 4 1,280 320 4 19,560 4(15)(320) 360 18 20 920 4(15) 320 18(15) 50 50 18 x y xy nx y b x nx a y bx Yx   (b) If the forecast is for 20 guests, the bar sales forecast is 50 + 18(20) = $410. Each guest accounts for an additional $18 in bar sales.
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2 2 71.59 0.511 27.1 0.159 352.9 12 2 71.59 13.85 56.11 .163 10 .404 (rounded to .407 in POM for Windows software) yx Y a Y b XY S n       2 2 yx Y a Y b XY S n     Problem 4.41 Add part G: Based on your answer to parts a and f , is the regression model a good fit for these data? (a) It appears from the following graph that the points do scatter around a straight line.
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This note was uploaded on 05/13/2011 for the course BUSORG 1070 taught by Professor Scala during the Spring '11 term at Pittsburgh.

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HW 4 Solutions - Homework 4 BUSQOM 1070, Spring 2011...

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