Variables in Science Experiments What makes an experiment
![Variables in Science Experiments What makes an experiment “fair”? Variables in Science Experiments What makes an experiment “fair”?](https://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-1.jpg)
Variables in Science Experiments What makes an experiment “fair”?
![Bell Work l In your composition notebook (or paper for today) answer the following Bell Work l In your composition notebook (or paper for today) answer the following](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-2.jpg)
Bell Work l In your composition notebook (or paper for today) answer the following question: l Q: Is the data in this statement qualitative or quantitative? Explain your answer in 2 -3 sentences – “I saw three red birds in the tree outside of my classroom window. ” l Define: independent, qualitative, constant, and quantitative variables
![Bell Work l In your composition notebook (or paper for today) answer the following Bell Work l In your composition notebook (or paper for today) answer the following](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-3.jpg)
Bell Work l In your composition notebook (or paper for today) answer the following question: l Q: Is the data in this statement qualitative or quantitative? Explain your answer in 2 -3 sentences – – “I saw three red birds in the tree outside of my classroom window. ” What were some of your ideas?
![SWBAT… l Describe the difference between an independent and dependent variable SWBAT… l Describe the difference between an independent and dependent variable](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-4.jpg)
SWBAT… l Describe the difference between an independent and dependent variable
![Variables l l A variable is something that is changed A constant, or control, Variables l l A variable is something that is changed A constant, or control,](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-5.jpg)
Variables l l A variable is something that is changed A constant, or control, is something that does not change
![Science experiments use… l l l Independent Variable: the one factor that is changed Science experiments use… l l l Independent Variable: the one factor that is changed](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-6.jpg)
Science experiments use… l l l Independent Variable: the one factor that is changed by the person doing the experiment Dependent Variable: the factor which is measured in the experiment Constants: all the factors that stay the same in an experiment
![A birdy example… Imagine you want to see what color of bird feeders your A birdy example… Imagine you want to see what color of bird feeders your](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-7.jpg)
A birdy example… Imagine you want to see what color of bird feeders your local birds preferred. Red? Blue? Green?
![Our Constants and Variables l l l Independent Variable: color of the feeders Dependent Our Constants and Variables l l l Independent Variable: color of the feeders Dependent](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-8.jpg)
Our Constants and Variables l l l Independent Variable: color of the feeders Dependent Variable: amount of seed eaten Constants: everything else that is kept the same, for example: – – – the location of the feeders the kind of feeder used putting the feeders out at the same time
![Our Experimental Design Constants Location of feeders Kind of seed Type of feeder Independent Our Experimental Design Constants Location of feeders Kind of seed Type of feeder Independent](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-9.jpg)
Our Experimental Design Constants Location of feeders Kind of seed Type of feeder Independent Variable Red Blue Green Dependent Variable Amount of Seed Eaten
![If everything except the independent variable is held constant, we can say: The experiment If everything except the independent variable is held constant, we can say: The experiment](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-10.jpg)
If everything except the independent variable is held constant, we can say: The experiment is FAIR. (ONLY the independent variable can change!)
![Why is it important to only change the independent variable? Why is it important to only change the independent variable?](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-11.jpg)
Why is it important to only change the independent variable?
![If you don’t… If you measure a change in the dependent variable, you won’t If you don’t… If you measure a change in the dependent variable, you won’t](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-12.jpg)
If you don’t… If you measure a change in the dependent variable, you won’t know whether it is the independent variable that is causing the change. Independent Variable
![Is Sam’s experiment fair? YES? NO? NO! It isn’t fair since the locations of Is Sam’s experiment fair? YES? NO? NO! It isn’t fair since the locations of](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-13.jpg)
Is Sam’s experiment fair? YES? NO? NO! It isn’t fair since the locations of the feeders were very different!
![Is Maria’s experiment fair? YES? NO? YES! It seems fair since Maria only changed Is Maria’s experiment fair? YES? NO? YES! It seems fair since Maria only changed](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-14.jpg)
Is Maria’s experiment fair? YES? NO? YES! It seems fair since Maria only changed the feeder color!
![Is Jessie’s experiment fair? YES? NO? NO! It isn’t fair since the feeders are Is Jessie’s experiment fair? YES? NO? NO! It isn’t fair since the feeders are](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-15.jpg)
Is Jessie’s experiment fair? YES? NO? NO! It isn’t fair since the feeders are not out at the same time, and we know that the weather was quite different each time. Perhaps the number and kind of birds that visited during the weeks were different due to the weather.
![What do you think? Terry loves birds and wants to see as many as What do you think? Terry loves birds and wants to see as many as](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-16.jpg)
What do you think? Terry loves birds and wants to see as many as she can in her yard. She wants to know whether she is wasting money buying an expensive mixed seed, when a cheaper brand just arrived at her local store. She wonders… will the expensive seed attract more birds to her back yard? How would you advise her to find out if the expensive seed is better?
![Terry’s Experimental Design Independent Variable ? Dependent Variable ? Constants ? Terry’s Experimental Design Independent Variable ? Dependent Variable ? Constants ?](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-17.jpg)
Terry’s Experimental Design Independent Variable ? Dependent Variable ? Constants ?
![Terry’s Experimental Design Independent Variable Kind of seed: Expensive Cheap Dependent Variable Number (and Terry’s Experimental Design Independent Variable Kind of seed: Expensive Cheap Dependent Variable Number (and](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-18.jpg)
Terry’s Experimental Design Independent Variable Kind of seed: Expensive Cheap Dependent Variable Number (and perhaps kinds) of birds that visit Constants l Location of feeders l. Type of feeder l. Way she measures the amount of seed eaten and the way she counts birds $
![How do we graph these variables? How do we graph these variables?](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-19.jpg)
How do we graph these variables?
![How do we graph these variables? How do we graph these variables?](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-20.jpg)
How do we graph these variables?
![Questions? Questions?](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-21.jpg)
Questions?
![Brain Dump l Take 3 minutes to summarize what we just learned in a Brain Dump l Take 3 minutes to summarize what we just learned in a](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-22.jpg)
Brain Dump l Take 3 minutes to summarize what we just learned in a few sentences. Your summary should respond to the SWBAT… – Describe the difference between an independent and dependent variable
![Brain Dump l l Take 3 minutes to summarize what we just learned in Brain Dump l l Take 3 minutes to summarize what we just learned in](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-23.jpg)
Brain Dump l l Take 3 minutes to summarize what we just learned in a few sentences. Your summary should respond to the SWBAT… – Describe the difference between an independent and dependent variable 2 Minute Break – Use bathroom quickly in this time if needed
![Classwork – Independent vs Dependent Variable Activity – Myth Busters Activity Classwork – Independent vs Dependent Variable Activity – Myth Busters Activity](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-24.jpg)
Classwork – Independent vs Dependent Variable Activity – Myth Busters Activity
![Homework • Complete assignment on website and/or FOCUS • Submit to FOCUS • Due: Homework • Complete assignment on website and/or FOCUS • Submit to FOCUS • Due:](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-25.jpg)
Homework • Complete assignment on website and/or FOCUS • Submit to FOCUS • Due: • A DAY: Tuesday, August 25 th @ 10 PM • B DAY: Wednesday, August 26 th @ 10 PM
![](http://slidetodoc.com/presentation_image_h2/860ad58a2ac7e8b51ca34776b222e788/image-26.jpg)
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- Slides: 27