PSYCH 104 Lecture Notes - Lecture 6: Internal Validity, Psych, Random Assignment
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Goal: to determine causal relationships between two variables. In order to conduct an experiment you must. Control extraneous variables (i. e. hold constant any variables that might yield a spurious association) Observe the effect of the independent variable(s) on the dependent variable(s) Independent variable (iv): the variable a researcher manipulates (i. e. changes or varies) (the presumed cause of an outcome) Some ivs are manipulated by a researcher to to potentially elicit different responses on a dv (e. g. amount of time given to completea task) But, other ivs cannot be manipulated by a researcher, but may still potentially be the cause of different responses on a. Dependent variable (dv): the variable a researcher measures after an iv (the presumed outcome of a cause) (the dv is predicted to be in uenced by the iv) Achieved by varying only the ivs and keeping everything else in the study the same.
