PSYC 330 Lecture Notes - Type I And Type Ii Errors, Confounding, Observational Error
17 Mar 2014
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Two independent variables- drug a or drug b (two levels in each variable) Drug a works regardless of drug b, and drug b works regardless of drug a. Main effect- when one variable has an effect regardless of other one. Drug a doesn"t help if don"t get drug b, but if do get drug b then drug a has effect. Drugs work together well/ taking nothing works but taking only drug a or drug b has neg effects. More than one iv (factor) and factors normally crossed. >, < expected means of iv on dv are greater or less then in each condition. Effects of iv variable w/in one level of noise in comparison to other iv variable with other level. In graph if lines aren"t parallel to each other then there is interaction b/c is a difference. Correlation between iv and dv while controlling for the other iv variables.
