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# Variables

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## Ana Jones

on 31 August 2017

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#### Transcript of Variables

Variables
Controls
Experiments also have constants or controlled variables. Controlled variables are things that a scientist wants to remain the same throughout the experiment.
Video
Independent
The
independent variable
is the one that is changed/controlled by the scientist.

To ensure a fair test, a good experiment has only
one
independent variable.

As the scientist changes the independent variable, he or she observes what happens or results from that change.

Dependent
Scientists
collect data on the dependent variable
to see how it responds to the change made to the independent variable.

Data can be
qualitative or quantitative

For example, if we want to measure how much water flow increases when we open a faucet, it is important to make sure that the water pressure in the pipes (the controlled variable) is the same through the entire experiment. That's because both the water pressure and the opening of a faucet have an impact on how much water flows.

If we change both of them at the same time, we can't be sure how much of the water flow is because of the faucet opening and how much because of the water pressure. In other words, it would be a fair test.

Most experiments have more than one
controlled variable.
Qualitative vs Quantitative
Qualitative

is want you observe about an object. Like how it smells, feels, color, etc. You can almost see the word quality in it.

Quantitative
is another type of observation meaning that it can be described or measure in numerical terms. Like there are 32 students in my lass. You can almost see the word quantity in it

For example, if you open a faucet part way (the independent variable), the quantity of water flowing (dependent variable) changes in response--you observe that the water flow increases.
You may highlight your notes as we go. All these notes are on the handout. Pay close attention because we are going to watch MythBusters so we can identify the variables. =)
A variable is any factor, trait, or condition that can exist in differing amounts or types.
An experiment usually has three kinds of variables: independent, dependent, and controlled.

Now lets work on the examples on the back of your notes
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