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Information Systems for you
Chapter 33 - Modelling 
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» Exam Answers
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Test Yourself (Page 312)
  1 He would need to sell 40 to break even
 
Examination Questions (page 355)
1(a)
(i)
(ii)


(iii)
Ambulance B
The time it will take for each ambulance to get to the emergency. The distance each ambulance will have to travel to get to the emergency.
Any two such as: There are no roadworks or other obstructions along any of the routes that they use. The time of day (some roads may be more congested than others at certain times of the day). The number of traffic lights/junctions which will slow the ambulance down.
(b)
(i)
(ii)
(iii)


(iv)
=b3*c3
@sum(d2:d4) or a similar formula.
Cell B2 contains a number Cell C6 contains text The value of a formula may be recalculated when the value of a number in a cell is changed.
You could try to lower the unit cost by using a different supplier. You could lower the quantity of the items and see how this affected the total value. Each of the numbers could be altered to see how the total changed.
(c)
  The systems analyst find out that the problems are by talking to the users. The systems analyst looks at all the possible ways of integrating these information systems and works out the costs of each option. The systems analyst reports the findings of the feasibility study to the management.
 
2(a)
  A mathematical representation of a real situation used to investigate the situation and make predictions.
(b)
  Ability to perform 'What If' calculations. Ability to re-calculate automatically when some of the values in the cells are altered. Ability to produce graphs and charts.
(c)
(i)



(ii)
Branch 1 had much fewer sales (about 1/3) than branch 2 yet still managed to produce a similar profit. The predicted figures for branch 1 were lower than the actual figures whereas with branch 2 it was the reverse situation.
Could have another column to work out the actual sales as a percentage of predicted sales. Could also work out the percentage profits for each branch.
4
Any five such as:
Ability to zoom in and out
Pre-defined shapes
Ability to see 3D view from plan view
Ability to change colours
Easy to cut/paste
Add dimensions to drawing
Can reflect shapes
Can rotate shapes