PSYC 217 Chapter Notes - Chapter 10: Cople, Speedstep, Factorial Experiment
Document Summary
Learning objectives: define a factorial design and discuss reasons why a researcher would use this design, describe what information is provided by main effects and interaction effects in a factorial design. Interpret a graph depicting results from a 2 x 2 experimental design. An independent variable can have more than 2 levels: Levels: terms something used to denote conditions in an experimental design. Researchers may want to add additional levels for many reasons the main reason being that a design with only 2 levels of independent variables may not provide enough information about the relationship between two variables. Also, remember that two variables can have a positive, negative or curvilinear relationship. The curvilinear relationship is hard to spot if an experiment only has 2 variables the third level is the one that shows us that relationship. An experiment can have more than one independent variable :
