Variables and Fair tests
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14 Terms
What is an Independent variable (IV)
The variable that is changed
What is a dependent variable
The variable that is measured or observed
What is a controlled variable
A variable that is kept the same
What is a fair test
A test where only one variable is changed and all others are kept the same
Why do scientists use controlled variables
To make the test fair
What does IV stand for
Independent Variable
What does DV stand for
Dependent Variable
What does CV stand for
Controlled Variable
What is reliability
Getting similar results when an experiment is repeated
How can reliability be improved
By repeating trials and calculating a mean
In an electromagnet experiment, if you count the number of paper clips picked up, what is the DV
The number of paper clips picked up
Give one controlled variable in an electromagnet experiment
The same battery, iron nail or wire
What could happen if more than one variable is changed?
The test may not be fair and the results may be unreliable.
Complete the sentence: A fair test changes ______ variable.
One