This task is about conducting a fair test.
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Anaru was a helper at his school's soccer tournament. To find a ball to use in the tournament, he had to decide which make of soccer ball would bounce the best. Anaru did a small experiment. He tested five different types of ball by getting different people from his class to drop a make of soccer ball from above their head. Below are the results of Anaru's experiment.
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| Make of soccer ball | How high the ball bounced (measured in metres) |
| Shooter | 1.6 m, 1.8 m, 1.6 m |
| Topflight | 2.0 m |
| Goalgetter | 2.1 m, 2.2 m, 2.2 m, 2.3 m |
| Striker | 1.4 m, 1.3 m |
| Demon | 2.3 m |
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a) |
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Which make of soccer ball do you think Anaru should use for the soccer tournament?
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| ii) |
Why did you choose this make?
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| b) |
One of the other players said that Anaru's experiment wasn't a 'fair test'.
Give two ways that Anaru's test wasn't a 'fair test'.
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i)
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ii)
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Anaru did another experiment which looked at the weight of some other soccer balls and how high they bounced. Below are the results of this experiment.
| Make of ball | Weight of ball (grams) | Average height of how high the ball bounced (metres) |
| Gamebreaker | 450 g | 1.2 m |
| Sharpshooter | 410 g | 1.5 m |
| Swift | 430 g | 1.3 m |
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c)
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Write a general sentence about the weight of a soccer ball and how high it bounces.
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