Control Groups vs. Experimental Groups
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Transcript of Control Groups vs. Experimental Groups
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Control Groups vs. Experimental Groups
Mr. MahLiving Environment
10/22/09
![Page 2: Control Groups vs. Experimental Groups](https://reader035.fdocuments.us/reader035/viewer/2022071808/5681349a550346895d9b8fed/html5/thumbnails/2.jpg)
Warm-Up Quiz
• Experiment: Does the amount of sleep affect a student’s grades?– Identify the INDEPENDENT VARIABLE,
DEPENDENT VARIABLE, and CONSTANT• IV: Amount of sleep• DV: Student’s Grade• Constant: Student, subject, test, etc.
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Control Groups vs. Experimental Groups
Mr. MahLiving Environment
10/22/09
![Page 4: Control Groups vs. Experimental Groups](https://reader035.fdocuments.us/reader035/viewer/2022071808/5681349a550346895d9b8fed/html5/thumbnails/4.jpg)
Experiment
• All experiments must have 3 things: independent variable, dependent variable, and control.
• When we conduct an experiment, we need something to compare our results to.– That is why the Control Group is important
![Page 5: Control Groups vs. Experimental Groups](https://reader035.fdocuments.us/reader035/viewer/2022071808/5681349a550346895d9b8fed/html5/thumbnails/5.jpg)
Control Group:
• . Group in an experiment a scientist purposely keeps the same because the outcome is known
• Used to compare to the experimental group.– Scientists need to compare their results to see
what changed
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Control Group?
• What is the control group in the following experiment?• Homer wants to see if eating donuts
before work makes him sleepy–Control Group: No donuts before work
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• Experiment: Qadr thinks that dropping acid on your eyes will make you blind.– Control Group: No acid in your eye
• Experiment: Brandon wants to measure if going to the bathroom every block hurts his grades.– Control Group: Not going to the bathroom during
class• Experiment: Diashawn wonders if eating chips
every morning is healthy– Control Group: Not eating chips every morning
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Experimental Group:
• Group in an experiment that is being changed in ONE way.
• The thing changed is called the independent variable.
• By changing the independent variable, scientists are looking to see if anything in the experimental group will be different from the control group.
• The difference scientists are looking for is caused the dependent variable.
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Identify the Experimental Group• Experiment: Drinking more water makes you
go to the bathroom more.–Drinking lots of water
• Experiment: Eating school lunch increases your chances of getting sick.– Eating the school lunch
• Experiment: Paying Mr. Mah everyday will make you a better student–Paying Mr. Mah everyday
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Practice• Terrece wants to see if eating candy in class
makes students more hyper in class– What are the IV, DV, constants?– Identify the Control Group and the Experimental
Group– IV: Eating candy– DV: How hyper students are in class– Constants: Amount of candy eaten, type of candy– Control Group: Students when they don’t eat candy– Experimental Group: Students when they eat candy