Basics of Research Design 2.22

Basics of Research Design 2.22 - Click to edit Master...

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Unformatted text preview: Click to edit Master subtitle style 6/3/11 Research Methods PSYC E226 2/22/2010 Basics of Research Design 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 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 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 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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This note was uploaded on 06/03/2011 for the course PSYC E226 taught by Professor Smolowitz during the Spring '10 term at South Carolina.

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Basics of Research Design 2.22 - Click to edit Master...

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