the scientific method* making observations asking questions developing a hypothesis designing an...
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![Page 1: The Scientific Method* Making observations Asking questions Developing a hypothesis Designing an experiment Collecting data Making inferences Results](https://reader035.vdocuments.net/reader035/viewer/2022062803/56649cad5503460f9496fdc3/html5/thumbnails/1.jpg)
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The Scientific Method*Making observationsAsking questionsDeveloping a hypothesisDesigning an experimentCollecting dataMaking inferencesResults (peer review)
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Experimental Design*Experiment: def. – an investigation
consisting of procedures that tests a hypothesis by collecting data under controlled conditions.
InvestigationProceduresControlled conditions
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Control vs. Experimental Group*Control: def – the standard in which
all conditions in the experiment are kept the SAME
*Experimental (test) group: def – all conditions are kept the same except for the condition in question being tested
Why do we need both groups?
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Flaming Dollar RevisitedQuestion: What is the effect of the
amount of isopropyl alcohol on the dollar bill’s burning intensity?
What is the Control Group?What is the Experimental Group?
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Flaming Dollar Control Group(Control: def – the standard in which
all conditions in the experiment are kept the SAME)
Control group – soak the dollar bill in ONLY WATER. (NO ALCOHOL IN SOLUTION)
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Flaming Dollar Experimental Group(Experimental group: def – all
conditions are kept the same except for the condition in question being tested)
Experimental group – soak the dollar bill in varying concentrations of isopropyl alcohol. (testing the effect of amount of alcohol)
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Variables*Independent variable: def – the one condition that is tested because it affects the outcome of the experiment
*Dependent variable: def – the observable condition that “depends” on changes made to the independent variable
![Page 9: The Scientific Method* Making observations Asking questions Developing a hypothesis Designing an experiment Collecting data Making inferences Results](https://reader035.vdocuments.net/reader035/viewer/2022062803/56649cad5503460f9496fdc3/html5/thumbnails/9.jpg)
Flaming Dollar RevisitedQuestion: What is the effect of the
amount of isopropyl alcohol on the dollar bill’s burning intensity?
What is the Independent Variable?What is the Dependent Variable?
![Page 10: The Scientific Method* Making observations Asking questions Developing a hypothesis Designing an experiment Collecting data Making inferences Results](https://reader035.vdocuments.net/reader035/viewer/2022062803/56649cad5503460f9496fdc3/html5/thumbnails/10.jpg)
Flaming Dollar Independent Variable(Independent variable: def – the one
condition that is tested because it affects the outcome of the experiment)
Independent variable – the amount (concentration) of alcohol used in solution to soak the dollar bill
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Flaming Dollar Dependent Variable(Dependent variable: def – the
observable condition that “depends” on changes made to the independent variable)
Dependent variable – the burning intensity that depends on the different amounts of alcohol used.
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FINAL THOUGHT!*ONLY TEST ONE variable at a time!!!
Example: Flaming DollarAmount of alcohol usedDifferent $ bill amounts used
MUST TEST SEPARATELY!!!