1. Mobile phone tariffs
total costs for 600 minutes per month
£50.00
£40.00
£30.00
£20.00
£10.00
£0.00
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1 Write down three pieces of
information that this graph tells you.
2 Which tariff would you prefer?

2. Mobyphone mobile phone model
Enter
minutes
300 Enter number 100-600
TARIFF OPTIONS
(monthly)
Monthly Free Extra Minutes Cost for extra Total cost
cost minutes minutes used minutes
Talk 15 £10.00 15 £0.06 300 £17.10 £27.10
Talk 30 £12.50 30 £0.05 300 £13.50 £26.00
Talk 45 £15.00 45 £0.04 300 £10.20 £25.20
Talk 60 £17.50 60 £0.03 300 £7.20 £24.70
Timefree Talk £30.00 0 £0.00 300 £0.00 £30.00
Pay As You Go £0.00 0 £0.08 300 £24.00 £24.00

3. Mobile phone tariffs
£50.00
£40.00
£30.00
Total cost
£20.00
£10.00
£0.00
Minutes used
100 200 300 400 500 600
Talk 15 Talk 45 Pay as You go

4. Learning outcomes
All students will be able to develop ICT-based models and test
predictions by changing variables and rules.
Most Students will be able to develop ICT-based models and test
predictions by changing variables and rules and be able to say why
there prediction was right or wrong
Some Students will be able to develop ICT-based models and test
predictions by changing variables and rules and be able to say why
there prediction was right or wrong and elaborate on how they could
adapt it to make it better.

5. Possible advantages of using ICT to produce
graphical representations of data
O Automatically produces a key, a title and labels for the
axes
O Easily produces graphs that are visually appealing
O Allows you to try and to investigate different types of
graph
O Graphs can be changed automatically as data changes
O Produces graphs very quickly
O Allows scales to be changed easily

6. Possible disadvantages of using ICT to
produce graphical representations of data
O It is too easy to use the wrong kind of graph
O The most visually appealing graph is not necessarily
valid
O Automatic rescaling can lead the unwary into false
conclusions

7. Possible disadvantages of using ICT to
produce graphical representations of data
O It is too easy to use the wrong kind of graph
O The most visually appealing graph is not necessarily
valid
O Automatic rescaling can lead the unwary into false
conclusions