Chapters+07+and+08

Chapters+07+and+08 - Experimental Designs:...

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Experimental  Designs: Independent Groups (ch 7), Dependent Groups (ch 8), and  Mixed Groups (ch 8)
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Five General Designs Experimental, Independent Groups Aka: between subjects Experimental, Dependent Groups Aka: related, repeated, within, matched subjects Experimental, Mixed Groups Single-subject Designs Non-Experimental Sometimes use “samples”, “subjects”, or  “participants”  instead of “groups” in the  names.
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Experimental, Independent  Groups Designs
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Independent groups designs Goal   in conducting experiments   to show that an IV causes a change in the DV.  only possible with TRUE experimental designs True experimental designs The independent variable(s) must be under the  control of the researcher. Participants are randomly assigned to the levels of  the IV. Quasi-experimental design   The level of the IV is chosen by the participants, or the IV is a participant variable/characteristic. Cover in more detail when we get to ch 10
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Steps in conducting an  experiment Step 1. Formulate a hypothesis Step 2. Select appropriate independent and  dependent variables and operationally define  them Step 3. Limit alternative explanations for  variation Step 4. Manipulate the IV(s) and measure the  DV(s) Step 5. Analyze the variation in the DV(s) Step 6. Draw inferences about relationship  between IV(s) and DV(s)
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Where we do experiments In the lab Advantages: Better control over the independent variable
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Chapters+07+and+08 - Experimental Designs:...

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