Scientific Process METHODS
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Transcript of Scientific Process METHODS
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Scientific ProcessMETHODS
Questionto
Experimental Designto
Data Analysis
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QuestionI will examine if …..I predict ……….The objective of this study is to show …
********** affects *********** this waytreatment response
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QuestionI will examine if …..I predict ……….The objective of this study is to show …
********** affects *********** this waytreatment response
Determines how to organize the
experiment
Determines what to measure
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Experimental Context
chemistryphysics
geneticspsychology
animal behaviorvirologydisease
ecologysociologyeducationastronomy
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Experimental Context
chemistryphysics
geneticspsychology
animal behaviorvirologydisease
ecologysociologyeducationastronomy
LABORATORY FIELD
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Experimental Context
chemistryphysics
geneticspsychology
animal behaviorvirologydisease
ecologysociologyeducationastronomy
LABORATORYmore control
FIELDmore realistic
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Experimental Context
chemistryphysics
geneticspsychology
animal behaviorvirologydisease
ecologysociologyeducationastronomy
LABORATORYmore control
FIELDmore realistic
human subjectmore realistic
animal modelmore control
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EXPEIMENTAL TRADE-OFFS
• generality versus confidence
• realism versus control
• replication versus cost
• complexity versus control and cost
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Experimental Design
• Control
• Random sampling
• Replication
• Sample size
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Experimental Design
• Control– provide a comparison
• Random sampling
• Replication
• Sample size
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Experimental Design
• Control– provide a comparison
• Random sampling– avoid bias– representative sample
• Replication
• Sample size
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Experimental Design
• Control– provide a comparison
• Random sampling– avoid bias– representative sample
• Replication– control for unknown variables– quantify variance
• Sample size
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Experimental Design
• Control– provide a comparison
• Random sampling– avoid bias– representative sample
• Replication– control for unknown variables– quantify variance
• Sample size– increase power
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Refine the research objective
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Refine the research objective
Determine Treatment(s)• one treatments with control• multiple treatments‘ with control• gradient of treatments with control
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Refine the research objective
Determine Treatment(s)• one treatments with control• multiple treatments' with control• gradient of treatments with control
Determine Response(s)• number of responses• measured versus counts• what the data will ‘look’ like
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Refine the research objective
Determine Treatment(s)• one treatments with control• multiple treatments' with control• gradient of treatments with control
Determine Response(s)• number of responses• measured versus counts• what the data will ‘look’ like
Determine Appropriate Analysis• number of treatments• nature of the data• question asked
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