# 56:171 Operations Research Midterm Exam Solutions Fall 2001

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1 56:171 Operations Research Midterm Exam Solutions Fall 2001 True/False: Indicate by "+" or "o" whether each statement is "true" or "false", respectively: o_ 1. If a primal LP constraint is slack at the optimal solution, then the optimal value of the dual variable for that same constraint must be positive. +_ 2. In reference to LP, the terms "dual variable" and "simplex multiplier" are synonymous. +_ 3. If you make a mistake in choosing the pivot row in the simplex method, the next basic solution will have one or more negative basic variables. +_ 4. An assignment problem is a special type of linear programming problem. +_ 5. Every basic feasible solution of an assignment problem is degenerate. o_ 6. A degenerate solution of an LP is one which has more nonbasic than basic variables. +_ 7. If a basic feasible solution of a transportation problem is not degenerate, the next iteration must result in an improvement of the objective. o_ 8. The two-phase simplex method solves for the primal variables in phase one, and then solves for the dual variables in phase two. o_ 9. In a "balanced" transportation problem, the number of sources equals the number of destinations +_ 10. The minimum expected regret is never less than the expected value of perfect information. o_ 11. A dual variable for an equality constraint is always zero. o_ 12. In a maximization LP problem, if the right-hand-side of a greater-than-or-equal constraint is increased, the objective function will either remain the same or increase. Match the four hypothetical graphs of optimal value vs right-hand-side to the appropriate combination of min/max and inequality type, by writing the correct letter (A,B,C,D) in the blanks. _B_ 13. Min cx st Ax b _C 14. Min cx st Ax b _D_ 15. Max cx st Ax b _A_ 16. Max cx st Ax b e_ 17. If, in the optimal primal solution of an LP problem (min cx st Ax b, x 0), there is zero slack in constraint #1, then in the optimal dual solution, a. dual variable #1 must be zero c. slack variable for dual constraint #1 must be zero b. dual variable #1 must be positive d. dual constraint #1 must be slack e. NOTA c_ 18. If, in the optimal solution of the dual of an LP problem (min cx subject to: Ax b, x 0), dual variable #2 is positive, then in the optimal primal solution, a. variable #2 must be zero c. slack variable for constraint #2 must be zero b. variable #2 must be positive d. constraint #2 must be slack e. NOTA d_ 19. If there is a tie in the "minimum-ratio test" of the simplex method, the solution in the next tableau a. will be nonbasic c. will have a worse objective value a. will be nonfeasible d. will be degenerate e. NOTA b_ 20. Bayes Rule is used to compute a. the joint probability of a state of nature and the outcome of an experiment b. the conditional probability of a state of nature given the outcome of an experiment c. the conditional probability of the outcome of an experiment given a state of nature d. NOTA 56:171 O.R. Midterm Exam Sol ns Fall 2001 page 1 of 7

2 The problems below refer to the following LP: (with inequalities converted to equations:) Minimize 8X1 + 4X2 Minimize 8X1 + 4X2 subject to 3X1 + 4X2 6 subject to 3X1 + 4X2 + X3 = 6 X1 + 4X2 4 X1 + 4X2 X4 = 4 5X1 + 2X2 10 5X1 + 2X2 + X5 = 10 X1 0, X2 0 Xj 0, j=1,2, 3,4,5 _c 21.The feasible region includes points a. B, F, & G c. C, E, & F e. B, D, & G b. A, B, C, & F d. E, F, &G f. NOTA _e 22. At point F, the basic variables include the variables a. X2 & X3 c. X4 &X5 e. X2 & X5 b. X3 & X4 d. X1 & X4 f. NOTA _c 23. The dual of the original LP (before introducing slack & surplus variables) has the following constraints (not including nonnegativity or nonpositivity constraints): a. 2 constraints of type ( ) c. 2 constraints of type ( ) e. NOTA b. one each of type & d. one each of type & = _b 24. The dual of the LP has the following types of variables: a. two non-negative variables and one non-positive variable d. three non-negative variables b. one non-negative and two non-positive variables e. three non-positive variables c. two non-negative variables and one unrestricted in sign f. NOTA _f 25. If point F is optimal, then which dual variables must be zero, according to the Complementary Slackness Theorem? a. Y1 and Y2 c. Y2 and Y3 e. Y2 only b. Y1 and Y3 d. Y1 only f. Y3 only _d 26. When using the Hungarian method to solve assignment problems, if the number of lines drawn to cover the zeroes in the reduced matrix is equal to the number of rows, a. this indicates that no solution exists. c. a mistake occurred; one should review previous steps. b. a dummy row or column must be introduced d. this means an optimal solution has been reached. The following is a transportation tableau, with an initial set of shipments indicated: 27. Is the solution above a basic feasible solution? _yes_ 56:171 O.R. Midterm Exam Sol ns Fall 2001 page 2 of 7

3 Complete the computation of a set of dual variables for the above transportation tableau, starting by assigning the dual variable for source #1 equal to zero: 28. Dual variables for the supply constraints: U 1 = 0, U 2 = _+1_, U 3 = Dual variables for demand constraints: V 1 = +5, V 2 = +1, V 3 = +2, V 4 = _+2_ 30. Compute the reduced costs for X 21 _0_ = 6 (1+5) 31. & X 31 _ 4 =3 (2+5) _b_ 32. Which of these two variables should enter the basis? a. X 21 b. X 31 c. both d. neither _c_ 33. Which basic variable should leave the basis? a. X 11 b. X 12 c. X 22 d. X 23 e. X 33 f. NOTA _b 34. If Xij>0 in the transportation problem, then dual variables U and V must satisfy a. Cij > Ui + Vj c. Cij < Ui + Vj e. Cij = Ui -Vj b. Cij = Ui + Vj d. Cij + Ui + Vj = 0 f. NOTA Sensitivity Analysis in LP. Consult the LINDO output below to answer the questions: _a 35. The number of optimal solutions of this LP is a. exactly one c. infinite e. NOTA b. exactly two d. none Suppose that a failure of one of the Wheeling presses in June shuts down production for ten hours. _a 36. The resulting increase in cost is (in dollars) a. between 0 and 100 ( ) c. between 200 and 300 e. between 400 and 500 b. between 100 and 200 d. between 300 and 400 f. greater than 500 _c 37. Taking into account this failure is equivalent to a. increasing the variable WN1 by 10 c. increasing the variable SLK2 by 10 e. NOTA b. decreasing the variable WN1 by 10 d. decreasing the variable SLK2 by 10 _a 38. If a pivot were performed to enter SLK2 into the basis, the variable leaving the basis would be a. SLK3 by min ratio test c. WN1 e. RN1 g. NOTA b. SLK7 d. WG1 f. RG1 _c 39. If a pivot were performed to enter SLK2 into the basis, the resulting value of SLK2 would be a. between 0 and 100 c. between 200 and 300 ( /1.067) e. between 400 and 500 b. between 100 and 200 d. between 300 and 400 f. greater than The effect on variable WN1 of an increase of 10 in the variable IG2 would be to ( increase / decrease ) by _8 b 42. Suppose that the monthly storage cost of a nylon tire at the end of June were to increase from 10 cents to 15 cents. Then a. neither the basis nor the values of the variables will change b. both the basis and the values of the variables will change since the basis B changes c. the basis will not change, but the values of the variables will change d. insufficient information is available to answer this question e. NOTA _c 43. Suppose that the demand for fiberglass tires in June were to double. Then a. neither the basis nor the values of the variables will change b. both the basis and the values of the variables will change c. the basis will not change, but the values of the variables will change since x ( ) 1 B = AB b &b changes d. insufficient information is available to answer this question e. NOTA An automobile tire manufacturer has the ability to produce both nylon and fiberglass tires. During the next 3 months, they have agreed to deliver the following quantities: Date Nylon Fiberglass June July August :171 O.R. Midterm Exam Sol ns Fall 2001 page 3 of 7

4 The company has two presses, referred to as the Wheeling and Regal machines, and appropriate molds which can be used to produce these tires, with the following production hours available in the upcoming months: Month Wheeling Regal June July August The production rates for each machine-and-tire combination, in terms of hours per tire, are as follows: Tire Wheeling Regal Nylon Fiberglass Production costs per tire, including labor and materials, are Tire Wheeling Regal Nylon Fiberglass The inventory carrying charge is \$0.10 per tire per month. Decision variables: WNt = number of nylon tires to be produced on the Wheeling machine during month t, t=1,2,3 RNt = number of nylon tires to be produced on the Regal machine during month t, t=1,2,3 WGt = number of fiberglass tires to be produced on the Wheeling machine during month t, t=1,2,3 RGt = number of fiberglass tires to be produced on the Regal machine during month t, t=1,2,3 INt = number of nylon tires put into inventory at the end of month t, t=1,2 IGt = number of fiberglass tires put into inventory at the end of month t, t=1,2 MIN 0.75 WN RN WG RG IN IG WN RN WG RG IN IG WN RN WG RG3 SUBJECT TO 2) 0.15 WN WG1 <= 700 3) 0.16 RN RG1 <= ) 0.15 WN WG2 <= 300 5) 0.16 RN RG2 <= 400 6) 0.15 WN WG3 <= ) 0.16 RN RG3 <= 300 8) WN1 + RN1 - IN1 = ) WG1 + RG1 - IG1 = ) IN1 + WN2 + RN2 - IN2 = ) IG1 + WG2 + RG2 - IG2 = ) IN2 + WN3 + RN3 = ) IG2 + WG3 + RG3 = 5000 END OBJECTIVE FUNCTION VALUE 1) VARIABLE VALUE REDUCED COST WN RN WG RG IN IG WN RN WG RG IN IG WN RN WG RG ROW SLACK OR SURPLUS DUAL PRICES 2) ) ) :171 O.R. Midterm Exam Sol ns Fall 2001 page 4 of 7

5 5) ) ) ) ) ) ) ) ) RANGES IN WHICH THE BASIS IS UNCHANGED: OBJ COEFFICIENT RANGES VARIABLE CURRENT ALLOWABLE ALLOWABLE COEF INCREASE DECREASE WN RN WG RG INFINITY IN IG WN INFINITY RN INFINITY WG INFINITY RG INFINITY IN INFINITY IG INFINITY WN RN WG INFINITY RG INFINITY THE TABLEAU RIGHTHAND SIDE RANGES ROW CURRENT ALLOWABLE ALLOWABLE RHS INCREASE DECREASE INFINITY INFINITY ROW (BASIS) WN1 RN1 WG1 RG1 IN1 IG1 1 ART WN SLK WG RN WN SLK RN WG IN IG RN WG :171 O.R. Midterm Exam Sol ns Fall 2001 page 5 of 7

6 ROW WN2 RN2 WG2 RG2 IN2 IG2 WN ROW RN3 WG3 RG3 SLK 2 SLK 3 SLK 4 SLK ROW SLK 6 SLK E Decision Analysis The government is attempting to determine whether immigrants should be tested for a certain contagious disease. Let's assume that the decision will be made strictly on a financial basis. Assume that each immigrant who is allowed into the country and has the disease (event D) costs the U.S. \$200,000, and each immigrant who enters and does not have the disease (event N) will contribute \$10,000 to the national economy. Assume that 5% of all potential immigrants have this disease. The government's goal is to maximize (per potential immigrant) expected benefits minus expected costs. A tree representing the government's decision appears below. 56:171 O.R. Midterm Exam Sol ns Fall 2001 page 6 of 7

7 _b_ 44. The optimal decision is a. admit all immigrants c. the government is indifferent b. deny admission to all immigrants d. NOTA Suppose that there is a medical test which may be administered before determining whether a potential immigrant should be admitted. The cost of this test is \$500 per person. The test result is either positive (event +) indicating presence of the disease or negative (event ) indicating absence of the disease, but the test is somewhat unreliable: 10% of all people with the disease test negative, and 5% of the persons without the disease test positive Complete the following blanks P{D} (prior probability) 0.05 P{N} (prior probability) 0.95 P{+ D} 0.90 P{ D} 0.10 P{+ N} 0.05 P{ N} 0.95 P{+} P{ } P{D +} P{D } P{N +} P{N } The decision tree below includes the decision as to whether or not administer the medical test. Note that the \$500 cost of the test has not been incorporated in the payoffs at the far right "Fold back" nodes 2 through 8, and write the missing values of the nodes below: Node Value Node Value Node Value _e_ 50. The expected value of the test result (in \$) is (Choose nearest value): a. 0 b. 500 c d. 5,000 e. 7,500 (\$8026) f. 10,000 g. 20,000 h. 20,000 56:171 O.R. Midterm Exam Sol ns Fall 2001 page 7 of 7

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