Comm 190
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Simon Fraser University *
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Course
190
Subject
Communications
Date
Jan 9, 2024
Type
Pages
30
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COMM 190 Midterm - The time limit is 1.5 hrs. The Data
required to solve this paper is already
Introduction To Quantitative Decision Making (The University of British Columbia)
Studocu is not sponsored or endorsed by any college or university
COMM 190 Midterm - The time limit is 1.5 hrs. The Data
required to solve this paper is already
Introduction To Quantitative Decision Making (The University of British Columbia)
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2022W1 COMM 190 Midterm Results Score for this quiz: 56
out of 81
Submitted Oct 20 at 9:02p.m.
This attempt took 90 minutes.
0.5 / 0.5 pts
Question 1
Academic pledge. Please read carefully.
I hereby agree that I will not give or receive unauthorized help on this
exam, that all work will be my own, and that I will abide by the rules
outlined below.
I am not allowed to:
Communicate in any way
with other students until after the exam is
over.
Post questions, content, screenshots, ideas, etc
., from the exam
on any public or private sites, or otherwise share such material.
I understand that failure to adhere to this pledge may result in severe
disciplinary action.
I agree and I understand Correct!
Correct!
Please periodically check the bottom of the exam to make sure your
answers are saving.
If everything is working great:
"Quiz saved at [local time]
"Not Saved" — THIS IS OKAY (KNOWN BUG IN CANVAS)
If your internet is not working properly:
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1 / 1 pts
Question 2
Colourful Constraints
An LP, shown below, has five constraints (in different colours) plus two
non-negativity constraints. Use this diagram to answer this and the
following True/False questions.
It is possible that some of the constraints are equality ("=" sign)
constraints.
True False Correct!
Correct!
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to reconnect by turning Wi-Fi off and back on. Downloaded by Jake Paul (hifat91162@locawin.com)
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1 / 1 pts
Question 3
Point E
violates the two non-negativity constraints but satisfies all of the
other constraints.
True False Correct!
Correct!
1 / 1 pts
Question 4
Points E
, F
, and G
violate the non-negativity of y.
True Correct!
Correct!
False 1 / 1 pts
Question 5
Point C
would be feasible if the Green constraint were removed.
True Correct!
Correct!
False 1 / 1 pts
Question 6
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Points A
and C
violate the same constraints.
True False Correct!
Correct!
1 / 1 pts
Question 7
Still Constrained
Now consider a different LP with three constraints (in different colours)
plus two non-negativity constraints. The constraints are all inequality
constraints (≤ or ≥). Use this diagram to answer this and the following
True/False questions.
If point B
is optimal, point C
cannot also be optimal.
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False Correct!
Correct!
1 / 1 pts
Question 8
If points B
and C
are both feasible solutions, then point D
must be feasible
as well.
True False Correct!
Correct!
0 / 1 pts
Question 9
If point C
is a feasible solution, then point A
could be the unique optimal
solution.
True ou Answered
ou Answered
False orrect Answer
orrect Answer
0 / 3 pts
Question 10
Vegetable Farm — Arugula and Bok
Choy
Consider a vegetable Farm problem: Each square metre of A
rugula uses
14 hours of weeding and 6 hours of harvesting; each square metre of B
ok
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Choy uses 6 hours of weeding and 4 hours of harvesting. (Arugula is a
leafy green vegetable; Bok Choy is related to cabbage.)
You have 140
hours of weeding and 80 hours of harvesting available.
Revenue is $24/Arugula square metre and $18/Bok Choy square metre,
and you want to maximize revenue. Set up and solve this LP by hand.
Answer this question and then continue with the True/False questions that
also pertain to this model.
What is the revenue at the optimal solution?
Just type the value, e.g., 400. Do not include a dollar sign, units, or other
characters. Do not include decimals.
346
ou Answered
ou Answered
orrect Answers
orrect Answers
360 (with margin: 0)
0 / 1 pts
Question 11
One of the non-negativity constraints is binding.
True orrect Answer
orrect Answer
False ou Answered
ou Answered
1 / 1 pts
Question 12
There are two binding constraints at the optimal solution.
True Correct!
Correct!
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False 1 / 1 pts
Question 13
Slope of weeding <= Slope of the isoprofit line <= Slope of harvesting
True False Correct!
Correct!
1 / 1 pts
Question 14
If the farm had an unlimited amount of hours of weeding and hours of
harvesting this problem would be infeasible.
True False Correct!
Correct!
2 / 2 pts
Question 15
Suppose the revenue per unit changes. For this question only, revenue is
now $11.3/Arugula square metre and $6/Bok Choy square metre.
What is the allowable increase of the objective coefficient for Arugula?
Just type the value. Do not include a dollar sign, units, or other characters.
Report to one decimal place (if necessary).
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2.7
Correct!
Correct!
2.7
orrect Answer
orrect Answer
3 / 3 pts
Question 16
Vegetable Farm — Minimizing Cost
Now consider a version of this LP where the farm wants to minimize
costs. Arugula costs $5.18/square metre to farm and Bok Choy costs
$2.62/square metre. The weeding and harvesting constraints are the
same as above. Additionally, the farm wants to produce at least 3 of each
square metre. Answer this question and then continue with the True/False
questions (they also pertain to this minimizing cost model).
What is the cost at the optimal solution? Report your answer in dollars without a dollar sign or other characters, to
2 decimal places (if necessary).
23.4
Correct!
Correct!
23.4
orrect Answer
orrect Answer
1 / 1 pts
Question 17
This model has 6 constraints in total.
True Correct!
Correct!
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1 / 1 pts
Question 18
This model has an unbounded feasible region.
True False Correct!
Correct!
1 / 1 pts
Question 19
If the cost per square metre of Arugula increased by $3, the optimal
solution would change.
True False Correct!
Correct!
2 / 2 pts
Question 20
Still continuing with the minimizing cost model, what is the shadow price
of harvesting?
Report your answer, to 2 decimal places (if necessary).
0
Correct!
Correct!
orrect Answers
orrect Answers
0 (with margin: 0)
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2 / 2 pts
Question 21
Brain Teaser
What is the optimal solution to the following LP:
max j – k
s.t.
j ≤ 1
k ≤ 1
j, k ≥ 0
(select the best answer)
(0, 1) (1, 1) (0, 0) (1, 0) Correct!
Correct!
(1, 0) and (0, 1) Please periodically check the bottom of the exam to make sure your
answers are saving.
If everything is working great:
"Quiz saved at [local time]
"Not Saved" — THIS IS OKAY (KNOWN BUG IN CANVAS)
If your internet is not working properly:
"Saving..." This indicates that there may be a problem with your Wi-Fi. Please try
to reconnect by turning Wi-Fi off and back on.
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10.5 / 12 pts
Question 22
Recycling Company
Each week your recycling company must ship at least a certain number of
truckloads of plastic waste from several cities to several processing plants
in other cities. This week they have determined the total cost is $41,050.
The following LP is solved to optimality, and the resulting sensitivity report
is produced.
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Answer the following questions using the information provided:
a. How many more truckloads could Kelowna receive compared to what
they are receiving?
20
Just type a number. Do not include other characters or decimals.
b. What is the total cost to ship from North Van to Princeton?
6000
Just type the number. Do not include a dollar sign, units, or other
characters. Do not include decimals.
c. How many of the non-negativity constraints are binding?
5
Type an integer.
d. What is the formula in H24?
=E14
Type the formula exactly as it should appear, starting with =
e. What is the formula in F25?
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Answer 1:
Answer 2:
=E15
Type the formula exactly as it should appear, starting with =
For the next three questions, if you cannot answer based on the
information given in the sensitivity report, type X.
f. Suppose the cost to ship from Vancouver to Kelowna increased by 10.
What would the total cost become? In other words, what value would be in
the green cell?
41550
Just type the number. Do not include a dollar sign, units, or other
characters. Do not include decimals.
g. Suppose instead that the capacity in Princeton decreased by 12. What
would the total cost be?
41590
Just type the number. Do not include a dollar sign, units, or other
characters. Do not include decimals.
h. Now suppose instead that the amounts Vancouver and Richmond must
ship each increased by 18 truckloads. What would the total cost be?
48520
Just type the number. Do not include a dollar sign, units, or other
characters. Do not include decimals.
20
Correct!
Correct!
20.0 orrect Answer
orrect Answer
6000
Correct!
Correct!
6000.00 orrect Answer
orrect Answer
$6000 orrect Answer
orrect Answer
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Answer 3:
Answer 4:
Answer 5:
Answer 6:
Answer 7:
$6000.00 orrect Answer
orrect Answer
6,000 orrect Answer
orrect Answer
6,000.00 orrect Answer
orrect Answer
5
Correct!
Correct!
five orrect Answer
orrect Answer
=E14
Correct!
Correct!
E14 orrect Answer
orrect Answer
=E15
Correct!
Correct!
E15 orrect Answer
orrect Answer
41550
Correct!
Correct!
41550.00 orrect Answer
orrect Answer
$41550 orrect Answer
orrect Answer
$41550.00 orrect Answer
orrect Answer
41,550 orrect Answer
orrect Answer
41,550.00 orrect Answer
orrect Answer
41590
Correct!
Correct!
41590.00 orrect Answer
orrect Answer
$41590 orrect Answer
orrect Answer
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Answer 8:
$41590.00 orrect Answer
orrect Answer
41,590 orrect Answer
orrect Answer
41,590.00 orrect Answer
orrect Answer
48520
ou Answered
ou Answered
X orrect Answer
orrect Answer
x orrect Answer
orrect Answer
2 / 2 pts
Question 23
Continue with the Recycling model for this question and the following
true/false questions.
The sum of the "Must Ship" values is less than the sum of the "Capacity"
values. Which of the following statements correctly explains why it is this
way?
(select the best answer)
None of the other answers is correct. The number of truckloads that will end up being received is less than the
amount that those three cities are able to handle.
Correct!
Correct!
Recycling processing plants could always handle more truckloads. Supply must not be less than demand. That is a mistake. The model should be infeasible. Downloaded by Jake Paul (hifat91162@locawin.com)
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1 / 1 pts
Question 24
All three of the capacity constraints at the processing plants are binding.
True False Correct!
Correct!
1 / 1 pts
Question 25
All four of the constraints about how many truckloads must be shipped
from the "From" locations are binding.
True Correct!
Correct!
False 0 / 1 pts
Question 26
If the capacities (at Surrey, Princeton, and Kelowna) were infinite, this
problem would not have an optimal solution because it would be
unbounded.
True ou Answered
ou Answered
False orrect Answer
orrect Answer
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1.5 / 3 pts
Question 27
A different version of the Recycling LP was solved, producing the
following sensitivity report.
Use this sensitivity report to answer these questions and the following
multiple choice questions. (And as always, consider each question about
the sensitivity report in isolation.)
a. What is the total cost at the optimal solution?
40350
Just type the number. Do not include a dollar sign, units, or other
characters. Do not include decimals.
b. In total, how many constraints are binding?
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Answer 1:
Answer 2:
6
Type an integer.
40350
Correct!
Correct!
40350.00 orrect Answer
orrect Answer
$40350 orrect Answer
orrect Answer
$40350.00 orrect Answer
orrect Answer
40,350 orrect Answer
orrect Answer
40,350.00 orrect Answer
orrect Answer
6
ou Answered
ou Answered
12 orrect Answer
orrect Answer
12.0 orrect Answer
orrect Answer
2 / 2 pts
Question 28
What will happen if the RHS of the North Van constraint is decreased by
20?
(select the best answer)
The target cell will decrease by at least $1950. Correct!
Correct!
The target cell will decrease by $1950. None of the other answers is correct. Downloaded by Jake Paul (hifat91162@locawin.com)
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The target cell will decrease by $3900. The target cell will decrease by at least $3900. 0 / 2 pts
Question 29
What will happen if the RHS of the Kelowna constraint decreases 21?
None of the other answers is correct. orrect Answer
orrect Answer
The optimal solution will not change but the target cell will change. Both the optimal solution and the target cell will change. ou Answered
ou Answered
The optimal solution will not change and the target cell will not change. The optimal solution will change, but the target cell will not change. 2 / 2 pts
Question 30
What will most likely happen if the cost of shipping from Vancouver to
Kelowna increases by $12?
(select the best answer)
Both the optimal solution and the target cell will change. Correct!
Correct!
The optimal solution will not change and the target cell will not change. The optimal solution will change, but the target cell will not change. None of the other answers is correct. Downloaded by Jake Paul (hifat91162@locawin.com)
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The optimal solution will not change but the target cell will change. 0 / 3 pts
Question 31
Miscellaneous Questions
Suppose we wish to create a constraint that says there must be at most 3
times more S
UVs than T
railers. Which of the following would be correct
ways to express this constraint in an LP?
(select all correct answers)
3S ≤ T ou Answered
ou Answered
–S + 3T ≥ 0 orrect Answer
orrect Answer
S/T ≤ 3 –3S + T ≤ 0 S ≤ 3T orrect Answer
orrect Answer
3S – T ≤ 0 ou Answered
ou Answered
S + 3T ≤ 0 2 / 2 pts
Question 32
Consider the following set of constraints, correctly graphed below:
x + 2y ≥ 10 5x + y ≤ 30 Downloaded by Jake Paul (hifat91162@locawin.com)
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x + 10y ≥ 40
Which of the points are in the feasible region?
(select all correct choices)
B C D There is no feasible region. E F G A 0 / 3 pts
Question 33
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This question and the following True/False questions also pertain to the
above graph of the three constraints. Assume, as always, that there are
non-negativity constraints as well.
What could we say about the LP if all three constraints had ≥ signs?
(select all correct answers)
There can be no optimal solution because the problem is certainly
unbounded.
The intersection just above D must be the optimal solution. ou Answered
ou Answered
The feasible region would be unbounded. Correct!
Correct!
Both of the non-negativity constraints could be binding simultaneously. The LP would be infeasble. One of the non-negativity constraints could be binding. orrect Answer
orrect Answer
Please periodically check the bottom of the exam to make sure your
answers are saving.
If everything is working great:
"Quiz saved at [local time]
"Not Saved" — THIS IS OKAY (KNOWN BUG IN CANVAS)
If your internet is not working properly:
"Saving..." This indicates that there may be a problem with your Wi-Fi. Please try
to reconnect by turning Wi-Fi off and back on.
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1 / 1 pts
Question 34
The region containing point F is unbounded.
True False Correct!
Correct!
1 / 1 pts
Question 35
The region containing point G
is unbounded.
True False Correct!
Correct!
1 / 1 pts
Question 36
If all three constraints had ≤ signs then the feasible region would have 5
corner points.
True Correct!
Correct!
False 1.5 / 3 pts
Question 37
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Consider this system of two equations:
7x + 12y = 97 (raking) 11x + 8y = 109 (baling)
To solve this system by elimination, which of the following are correct first
steps?
(select all correct answers)
Multiply baling by 1.5 orrect Answer
orrect Answer
Multiply raking by 12/8 Multiply raking by 7 and baling by 11. Multiply baling by 11/7 Multiply raking by 11/7 Correct!
Correct!
3 / 3 pts
Question 38
What is true about blending constraints?
(select all correct answers)
We generally set them up in Excel with some variables in the RHS. Correct!
Correct!
Excel rearranges them so that all the variables are on the left. Correct!
Correct!
The allowable increase and decrease of the RHS will be expressed as a
percent.
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They cannot have a negative shadow price because they involve
percentages, which are always non-negative.
They must be written so that they don't involve variables in both the
numerator and the denominator.
Correct!
Correct!
The sensitivity report will show LHS equal to RHS if the constraint is
binding.
Original Score: 1 / 3 pts Regraded Score: 1.5 / 3 pts
Question 39
This question has been regraded.
Consider a two-variable LP. When modelled in Excel and solved, the
solver says "The objective cell values do not converge."
Which statement(s) could be true about this LP?
(select all correct answers)
The feasible region is unbounded. Correct!
Correct!
The objective function begins with "min". orrect Answer
orrect Answer
The feasible region is a triangle. The feasible region is a line. There is no feasible region. The feasible region is a point. Downloaded by Jake Paul (hifat91162@locawin.com)
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0 / 3 pts
Question 40
Consider a two-variable LP. When modelled in Excel and solved, the
solver says "Solver found a solution. All constraints and optimality
conditions are satisfied."
This LP has five regular constraints plus the two non-negativity
constraints. All regular constraints are inequalities (≤ or ≥) except for one,
which is an equality constraint (=).
Which statement(s) could be true about the feasible region?
(select all correct answers)
The feasible region is a five-sided shape. The feasible region is a seven-sided shape. ou Answered
ou Answered
The feasible region is a triangle. The feasible region is a line segment. orrect Answer
orrect Answer
There is no feasible region. The feasible region is a point. orrect Answer
orrect Answer
2 / 4 pts
Question 41
University Counselling Services
University Counselling Services (UCS) provides mental health services to
students. They require a certain number of counsellors to work during
each 4-hour period from 08:00 (am) until 00:00 (midnight). The following
LP is solved to optimality.
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Answer 1:
Answer the following questions using the information provided:
a. What is the value in cell H5? 12
Just type a value as Excel would display it using the default formatting.
b. What is the value in cell H7? 12
Just type a value as Excel would display it using the default formatting.
c. How many of the Demand constraints are non-binding?
1
Just type the number with no other characters.
d. What type of LP is this?
Scheduling
Type a one-word answer, making sure you spell it correctly. A couple
variations on the word will be accepted.
12
ou Answered
ou Answered
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Answer 2:
Answer 3:
Answer 4:
1 orrect Answer
orrect Answer
1.0 orrect Answer
orrect Answer
1.00 orrect Answer
orrect Answer
12
ou Answered
ou Answered
0.5 orrect Answer
orrect Answer
.5 orrect Answer
orrect Answer
0.50 orrect Answer
orrect Answer
.50 orrect Answer
orrect Answer
1
Correct!
Correct!
scheduling
Correct!
Correct!
schedule orrect Answer
orrect Answer
scheduled orrect Answer
orrect Answer
0.5 / 0.5 pts
Question 42
What is Greg's favourite Excel function?
(select the best answer)
SUMPRODUCT
Correct!
Correct!
Dumb product! Downloaded by Jake Paul (hifat91162@locawin.com)
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11/10/22, 8:38 PM
https://canvas.ubc.ca/courses/101551/quizzes/562169/history?version=2
29/29
Yum product?
drum product
crumb PRODUCT Quiz Score: 56
out of 81
Downloaded by Jake Paul (hifat91162@locawin.com)
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