Harry has three dogs, they are the same size and breed. He wants to see if their weight increases over three weeks by giving them dry food but on week two he gives one of the dogs some wet food. Is this a fair test?
No
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5
The change that happens because of the independent variable
Dependent variable
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trap
No points!
Oops!
shark
Other team loses 15 points!
Okay!
rocket
Go to first place!
Okay!
baam
Lose 20 points!
Oops!
5
What produces valid data?
Fair Tests
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monster
Reset all scores!
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gold
Win 50 points!
Okay!
gift
Win 15 points!
Okay!
banana
Go to last place!
Oops!
5
Everything that stays the same
Controlled
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5
What is the variable called that is measured?
Dependent variable
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5
The one thing you can change, limiting to only one in an experiment
Independent variable
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5
Scientists call anything that can change and have different values in an experiment a _________
Variable
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5
The dependent variable depends on the ___________?
Independent variable
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5
What is the variable called that is changed by the scientist?
Independent variable
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thief
Give points!
5
10
15
20
25
magnet
Take 20 points!
Okay!
shark
Other team loses 15 points!
Okay!
lifesaver
Give 20 points!
Oops!
5
Lucy gives her plant the same amount of water everyday and checks the plant's height. What is the dependent variable?