PSYB01H3 Chapter Notes - Chapter 10: Repeated Measures Design, Experiment, Bar Chart
Document Summary
An independent variable can have more than two levels. In simplest experimental design: two levels of the independent variable. Researcher can design and experiment with three or more levels for several reasons. Two levels: may not provide enough information about the exact form of the relationship. When an experiment with a single independent variable has two levels it can be analyzed using statistical techniques such as t-test, when there are three or more levels an analysis of variance is the required test. Variables are sometimes related in a curvilinear fashion. Researchers frequently are interested in comparing more than two groups. An experiment can have more than one independent variable: factorial designs. Researchers often manipulate more than one independent variable in a single experiment. Two or three independent variables can operate simultaneously. Closer approximation of real-world conditions in which independent variables do not exist by themselves. In any given situation a number of variables are operating to affect behavior.
