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Basics of Research Design 2.22

Basics of Research Design 2.22 - ResearchMethods PSYCE226...

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Click to edit Master subtitle style  6/3/11 Research Methods PSYC E226 2/22/2010 Basics of Research Design
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 6/3/11 Learning Objectives Be able to define what constitutes an experiment Know the difference between independent and  dependent variables Identify the relationship of confounding variables  with main variables Know three ways to avoid confounding variables Know two ways to increase external validity in  experiments
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 6/3/11 Basics Components of Experiments Experiments  use several strategies to attempt to show  causation: Manipulation : change a variable for one group but not another Measurement : seeing how much this difference affects another  variable Comparison : seeing how the second variable is different in the  two groups Control : avoiding confounding variables 
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 6/3/11 Experiment Example A study aims to show that sleep is helpful in  completing a task.  Manipulation : One group is sleep deprived, another is told to  sleep 8 hours Measurement : Both groups are given a task to complete as  quickly as possible Comparison : Statistics are run to see if there is a difference  between the two groups Control : The groups are given tasks on the same day, in the  same lab
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 6/3/11 What is the cause? We can hypothesize that the lack of sleep is the  CAUSE for the difference between the two groups Sleep happened before the task Lack of sleep is logically related to performance There are no other plausible explanations Which kind of validity is relevant here?
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