psyc_aug27 - Monday Continued on Research in Psychology The...

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Monday August 27, 2007 Continued on Research in Psychology λ The Research Process λ An investigation consists of a sequence of planned steps. λ We reviewed figure 2.1 (Weiten) λ Basic investigative steps include: Form a hypothesis, design the study, collect the data, analyze the data and draw conclusions, and report the findings. λ Experiments find cause and effect relationships. λ Researchers manipulate a variable to see its effects on another. λ Review from August 24 lecture on variables. λ Extraneous variables are any variables (other than the independent) that may influence the dependent variable. λ Random assignment: each subject has an equal chance of being assigned to any condition of the independent variable. λ Random sampling: sample drawn randomly from the population. λ Other Experimental Designs λ Expose one group of two different conditions λ (For example:
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Unformatted text preview: Do people recognize positive or negative words more quickly?) λ Use more than one dependent variable λ Manipulate two independent variables λ Strength in Experimental Research λ Conclusions about cause-effect can be made. λ Weaknesses λ Nature of experiments are relatively artificial. λ There are ethical issues/limits concerning experiments. λ λ Correlational Studies λ Correlational studies identify associations between variables. λ These kinds of studies are useful when one cannot manipulate the independent variable. λ Two alternative explanations in correlational findings: λ Third-variable complication (extraneous variable) λ Directionality (reverse causality problem) λ Perhaps some people just have tendencies that are unrelated to the study. λ **Correlation does not equal causation!...
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  • Spring '08
  • Psychology, Causality, dependent variable Manipulate, Experimental Research Conclusions, independent variables Strength

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