chap08 - ExperimentalDesign InternalValidity...

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    Experimental Design
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    Internal Validity Can we say that one variable causes  another? A study has internal validity to the  extent that you can conclude that one  variable caused the other
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    Confounding Variables Recall that experiments control for third  variables and thus have greater internal  validity Confounding occurs when the  experiment fails to control for a third  variable 
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    Threats to Internal Validity One-group case study X is the treatment or independent  variable O is the observation or dependent  variable No control condition to know if the IV  affects the DV X   O
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    One-group Pretest-Posttest  Design Observe change from pretest to posttest  to see if IV has an effect on the DV But there are lots of alternative  explanations for such change O   X   O
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    Problems with this design
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chap08 - ExperimentalDesign InternalValidity...

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