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Published byDerrick Rodgers Modified over 8 years ago
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Designing an experiment First state the problem.( Asking a question) Collect information. Formulate a hypothesis which will drive your experiment. Test Hypothesis-Design an experiment.
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What is an experiment? An experiment is a procedure designed to test a hypothesis. The results of an experiment will either support a hypothesis or cause it to be rejected.
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Designing an Experiment When designing an experiment, you must consider variables. Variables are any factor that can affect the results of an experiment. All experiments have two types of variables.
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Types of Variables Independent /Manipulated variables- are manipulated or controlled by the experiment. Dependent/ Responding variables- respond to changes in the independent variables. The dependent variable is the variable being measured in the experiment.
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Practice: Hypothesis: A plant grown in a larger pot will grow taller than one grown in a smaller pot. What is the independent/manipulated variable? What is the dependent /responding variable ?
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Independent and Dependent Variables QuestionIndependent Variable Dependent Variables How does salt affect water’s freezing point? Which fertilizer grows the largest apples? What size parachute slows a free fall faster?
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Types of groups used when designing an experiment A reliable experiment includes both a control and experimental group.
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Types of Groups Control group- represents the norm and shows what would happen when the independent variable is not manipulated or controlled.( the group that is not affected) Experimental group- has conditions identical to those of the control group except for the variable being studied.( the group that is being tested)
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Types of Groups …… To test a hypothesis fairly, only one independent variable in an experiment should be changed at a time. If more than one variable changes, it will not be clear which variable affected the dependent variable.
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