# analysis

BBA312 DECISION ANALYSIS Final Assignment Task brief & rubrics

Students are required to develop a report addressing the specific exercises set out in the guideline below. Your report should be 2000-2500 words, excluding

Exercise 1. (50%)

An important part of a production line has to be repaired. The industrial company is impacted by the stop of the production. Each day without producing costs

the company \$64 000. The maintenance team has only three possible options:

Option 1

He can return the part to the supplier who has agreed to collect, repair, and return it for free. However, there is no compensation for any losses supported by the

company because the machine is not working. The supplier will not agree to repair the machine if there has been a previous attempt to repair it. If the machine is

returned, the supplier will guarantee to return it in working order in 5 days’ time.

Option 2

He can call in a repairing company. They will charge \$40 000 to carry out the repair and they estimate that there is a 20% chance that they will be able to return

the machine to working order in 2 days. There is, however, a 80% chance that repairs will take 4 days.

Option 3

The maintenance team can attempt to repair it. He estimates that there is a 40% chance that he could mend the machine in 4 days. However, if at the end of 4

days the attempted repair has not been successful, he will have to decide whether to call the repairing company or to make a second attempt to repair. This would

take 3 further days, and he estimates that there is a 35% chance that this second attempt would be successful. If he fails at the second attempt, he will have no

alternative other than to call in the repairing company.

(a) Draw the decision tree of this problem

(b) Assuming that the maintenance department wants is to minimize the expected costs, what policy should they follow?

Exercise 2. (50%)

The company ABC is one of the most important specialists in electronic products.

In the last weeks there are several customers’ complaints due to the poor quality.

One of the Operations Managers starts a Quality Control to detect the possible problems.

After one week, the most common defects and their frequency are in the following table:

Defects DAYS

1 2 3 4 5 6 7

1 Too long 65 50 12 24 55 23 28

2 Bad quality material 21 32 14 11 20 18 10

3 Wrong labelling 3 3 1 2 0 4 5

4 Broken 0 3 0 3 0 3 0

5 Wrong date 20 16 15 20 18 16 18

6 Wrong packaging 0 8 0 4 3 4 5

7 Lack of components 17 11 12 10 17 19 24

8 Too short 1 0 4 0 4 2 3

9 Excess of components 69 57 58 55 62 59 65

10 Wrong components 5 1 7 2 4 6 1

TOTAL DEFECTS

(a) Draw the control chart that shows the evolution of the rate U= defects/unit (in %) in one week. If the same number of units are checked every day and

the goal is 1.5%, are we achieving the expectations?

(b) Construct the Pareto Chart and sort the defects in three groups according to the frequency.

One of the most common problems is related to the length of the product. A sample of 50 units (10 groups of 5 elements) is taken.

If the specification is 10+0.5, do you think that the process is making parts longer than usual?

1 2 3 4 5 6 7 8 9 10

10 10.1 10.2 10.2 10 10.3 10.2 10.1 10 10.3

10.2 10.3 9.9 9.8 10.1 10.2 10 10.1 9.9 10.1

10.3 10 10.1 10 10.2 10.1 10.1 10 10.3 10

9.8 9.9 10.3 10.1 10 10.4 9.8 10.1 10.1 10.2

10.1 10.2 10.4 10 9.9 9.7 10 9.8 10.4 9.9

(c) Compute the average of data, draw the control chart of the 10 groups and the histogram of 50 units to justify your answer.

Checking for possible causes that explain the problem, the manager concludes that the machinery is old, and the maintenance is poor.

(d) Suggest an Action Plan with several solutions to fix the problem.

Formalities:

• Word count: 2000-2500 words

• Font: Arial 12,5 pts.

• Text alignment: Justified.

• The in-text References and the Bibliography have to be in Harvard’s citation style.

Submission:

• Week 12: Via Moodle (Turnitin).

• Deadline: 08th January 2023 at 23:59 CEST.

Rubrics

Exceptional
90-100

Good
80-89

Fair
70-79

Marginal Fail
60-69

Knowledge &
Understanding (20%)

Student demonstrates
excellent understanding of key
concepts and uses vocabulary
in an entirely appropriate
manner.

Student demonstrates good
mentions some relevant
concepts and demonstrates
use of the relevant vocabulary.

and provides minimum theory
and/or some use of
vocabulary.

question but does not mention
key concepts or uses minimum
amount of relevant vocabulary.

Application (30%) Student applies fully relevant
knowledge from the topics
delivered in class.

Student applies mostly
relevant knowledge from the
topics delivered in class.

Student applies some relevant
knowledge from the topics
delivered in class.
Misunderstanding may be
evident.

Student applies little relevant
knowledge from the topics
delivered in class.
Misunderstands are evident.

Critical Thinking (30%) Student critically assesses in
excellent ways, drawing
outstanding conclusions from
relevant authors.

Student critically assesses in
good ways, drawing
conclusions from relevant
authors and references.

Student provides some
insights but stays on the
surface of the topic.
References may not be
relevant.

Student makes little or
noncritical thinking insights,
does not quote appropriate
authors, and does not provide
valid sources.

Communication (20%) Student communicates their
ideas extremely clearly and
concisely, respecting word
count, grammar and
spellcheck

Student communicates their
ideas clearly and concisely,
respecting word count,
grammar and spellcheck

Student communicates their
ideas with some clarity and
concision. It may be slightly
over or under the wordcount
limit. Some misspelling errors
may be evident.

Student communicates their
ideas in a somewhat unclear and
unconcise way. Does not reach
or does exceed wordcount
excessively and misspelling
errors are evident.

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