Chapter Graphic
: Best Value
Trend Task
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Level: Year 8
Approach: One to one
Focus: Interpreting a table and making a complex judgement.
280k
Resources: Table showing battery life.

Questions / instructions:
Johnny's family have a walkman, a radio, two torches and a portable computer. They are trying to find out which brand of battery would be best for them to buy. All of the batteries are the same size and the same price.
Give student the table.
Best Value Table
Battery Life in Hours
Battery Brands
Walkman
Radio
Torch
Portable Computer
Stay-brite
5 hours
19 hours
10 hours
3 hours
Super-life
7 hours
24 hours
13 hours
5 hours
High Power
4 hours
21 hours
12 hours
2 hours
Hot Shot
8 hours
28 hours
16 hours
6 hours
Super Cell
10 hours
26 hours
15 hours
4 hours
% responses
y8
1999(1995)

1. Look at this table. Which brand do you think Johnny's family should buy?

Hot shot
79(79)
Super Cell (second best)
16(17)
2. Why did you choose that brand of battery?
considered ranking for all appliances
46(58)
used data, but less thoroughly
46(35)
Commentary:
There was no difference between the 1995 and 1999 year 8 students in the decision made (Q1), but the 1999 students appear to have been a little less thorough in their justification (Q2).
 
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