Transcription of Chapter 9. Using Experimental Control to Reduce Extraneous ...
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Chapter 9. Using Experimental Control to Reduce Extraneous ...
9 - 1 Chapter 9. Using Experimental Control to Reduce Extraneous VariabilityIntroduction to Experimental ControlCharacteristics of a True ExperimentAdvantagesLimitationsThe Notion of Experimental ControlControl Through SamplingControl Through Assignment to ConditionsIndependent Samples DesignCorrelated Samples DesignControl Through Experiment SettingControl Through Experiment Consent and InstructionsControl Through Experimenter InteractionsControl Through Observation and MeasurementThinking Critically About Everyday InformationControl Through Use of Control Groups / Research DesignPrimitive Research DesignsImportance of Control GroupsDesigns With Control GroupsCase AnalysisGeneral SummaryDetailed SummaryKey Terms Review Questions/Exercises9 - 2 Introduction to Experimental ControlIn the previous Chapter , we saw how Extraneous variables can contribute to systematic error and to random error.
to generalize to a given population (increases external validity). However, as we discussed in Chapter 7, it is often difficult to obtain trulyrandom samples, and the researcher often resorts to the use of convenience sampling (such as using introductory psychology students). Thus, the researcher should consider how the
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