Identifying Variables

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# Identifying Variables - PowerPoint PPT Presentation

Identifying Variables. Step 4: Test your hypothesis. Types of Variables. There are 2 main types of variables: Independent Variable : The variable that is changed by the scientist; the ‘ I control ’ variable

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## Identifying Variables

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### Identifying Variables

Types of Variables

There are 2 main types of variables:

Independent Variable: The variable that is changed by the scientist; the ‘I control’ variable

Dependent Variable: The variable that might change because of what the scientist changes – what is being measured; the ‘data collected’

Remember!

Ex. If I drink Mountain Dew before bed, then I will not sleep very much.

IV: Drinking Mountain Dew

DV: the amount of sleep

Practice

Use this hypothesis to identify the variables:

If I leave all the lights on all day,

then my electric bill will be expensive

IV: ______________________

DV: ______________________

IV: ______________________

DV: ______________________

Now read the following experiment and identify the independent and dependent variables

Elizabeth wanted to test if temperature affected how fast milk goes bad and curdles. She left milk in a room temperature closet, a fridge, and a oven that was turned on low heat. She then measured how rotten the milk was after 10 days.

IV: ____________________________________

DV: ____________________________________

Controls
• The “other variables” that could be changed by the experimenter are known as “Controlled Variables”
• We must do our best to not allow these to change because they can alter the results of our experiment.
Demo
• Bond Fire: What makes a great fire to keep you warm?
• How can we test that?
• IV-
• DV-
• Controls-