Lecture 7 - Two-Group Experiments

Lecture 7 - Two-Group Experiments - TwoGroupExperiments

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    Two-Group Experiments
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    I.  Assigning Participants to  Groups *Goal – to start expt with equal groups A. Random assignment leads to  independent groups (p’s in one group  have no links to p’s in other group)
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    I. cont. A. Non-random assignment (correlated) 1.  Matched pairs – measure p’s on some  variable (other than IV) that may confound  results – may be necessary for small groups - matching variable must be relevant to  performance - create pairs that are equal on this variable - randomly assign each member to different  groups
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    I. Cont. Example: Does explaining rules to  children lead to better behavior? Possible confound: # of children,  mothers with more children may not  have enough time to explain rules 1,1,2,2,2,2,3,3,4,4,4,5 – Rules Explained 1,1,2,2,2,2,3,3,4,4,4,5 – No Explanation
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    I. Cont. Example #2 – How does sleep 
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Lecture 7 - Two-Group Experiments - TwoGroupExperiments

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