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Definition: A diagram with two axes, an x-axis and a y-axis, that shows one variable on each axis.

Sentence: To show the collected data, they made a graph.

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Definition: An experimental variable is the variable in an experiment that is changed.

Sentence: In the experiment, the scientist changed the experimental variable to test his hypothesis.

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Definition: A control variable is not changed in an experiment.

Sentence: To make sure he could understand the results of the experiment, the scientist made sure not to change any of the control variables.

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Definition: The average of a set of numbers is the sum of all the values in the set divided by the number of items in the set.

Sentence: To simplify the results, I took the average of the values.

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Definition: A variable is a quantity that changes.

Sentence: Speed, a variable, changed throughout the experiment.

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Definition: An explanation that takes a long time to create and is supported by a lot of evidence.

Sentence: After being tested many times, the hypothesis became a theory.

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Definition: Inquiry is the process of asking a question and finding the answer to the question.

Sentence: The detective made an inquiry about what the crime was.

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Definition: A hypothesis is an unproven explanation that can be tested using scientific evidence.

Sentence: After making observations of what happened in the 3-hole bottle experiment, we made a hypothesis to explain why we thought it happened.