PSYCH 13 Chapter Notes - Chapter 2: The Technique, Random Assignment, Observational Learning
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2. 2 research designs: scienti c methods of answering questions are of three types, the observational, correlational, and experimental method, the observational method. Increases in the value of one variable are associated with increases in the value of the other variable: height and weight are positively correlated; the taller people are, the more they tend to weigh, negative correlation a) +1. 00: 1. 00 means that two variables are perfectly correlated in a positive direction, 0 means that two variables are not correlated, 1. 00 means that two variables are perfectly correlated in a negative direction. Internal validity in experiments: making sure that nothing besides the independent variable can a ect the dependent variable, experiments should be high in internal validity. 1. the trade-o between internal and external validity in conducting research: it is very di cult to do one experiment that is both high in internal validity and generalizable to other situations and people.
