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Chapter 6

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Department
Psychology
Course
PSYB01H3
Professor
Nussbaum D
Semester
Fall

Description
Chapter 6 True experiment controlled investigation in which one or more variables are manipulatedResearcher has complete control over the manipulation of the independent variableThis allows for testing whether systematically varying the independent variable causes changes in the dependent variable In psychology causal explanations are much more difficult to establish than in some of the other sciences even with true experiments Basics of ExperimentationThe defining feature of an experiment is the degree of control a researcher exercises over all aspects of the study design In an experiment the researcher controls with whom with what and how the study is conducted Also controls what levels of the independent variable are to be manipulated Finally they control how the experiment is conducted by holding constant certain aspects time place setting of the study Experimental Control Def holding constant as many extraneous variables as possible so that any effect on the dependent variable can be attributed to changes in the independent variable Researcher exercises experimental control by holding constant as many extraneous variables as possible If a variable is held constant it cannot account for the results of the experiment The statistically significant results of the study establishing a relationship between changes in the independent variable and performance on a dependent variable cannot be confounded by a third variable as long as this third variable has been held constantVariables can be held constant by standardization of test administration and scoring Randomization Def procedures that are used to counteract bias whether randomizing order of presentation of test stimuli or randomly assigning participants to different study conditions Researchers randomize unwanted effects that cannot be experimentally controlled by holding them constant or by measurement Randomization is used in assigning participants to groups or to different levels of an independent variable
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