# Scientific Method - Controls and Variabl

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Information about Scientific Method - Controls and Variabl
Science-Technology

Published on March 5, 2009

Author: mswage

Source: authorstream.com

Scientific Method - Controls and Variables : 1 Scientific Method - Controls and Variables Scientific Experiments Follow Rules. : 2 Scientific Experiments Follow Rules. An experimenter changes one factor and observes or measures what happens. The Control Variable : 3 The Control Variable The experimenter makes a special effort to keep other factors constant so that they will not effect the outcome. Those factors are called control variables. What is the Purpose of a Control? : 4 What is the Purpose of a Control? Controls are NOT being tested Controls are used for COMPARISON Other Variables : 5 Other Variables The factor that is changed is known as the independent variable. The factor that is measured or observed is called the dependent variable. Example of Controls & Variables : 6 Example of Controls & Variables For example, suppose you want to figure out the fastest route to walk home from school. You will try several different routes and time how long it takes you to get home by each one. Since you are only interested in finding a route that is fastest for you, you will do the walking yourself. What are the Variables in Your Experiment? : 7 What are the Variables in Your Experiment? Varying the route is the independent variable The time it takes is the dependent variable Keeping the same walker throughout makes the walker a control variable. One more thing… it is best to make several trials with each independent variable. : 8 One more thing… it is best to make several trials with each independent variable. Slide 9: 9

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