Experimental Research Strategy

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Chapter 7

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23 Terms

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Experimental Research Strategy

  • the only research strategy that can determine cause-and-effect relationships between variables

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Four basic elements of an experiment (have to satisfy all 4 to be real/true experiment)

  1. manipulation of an independent variable

  2. measurement of a dependent variable

  3. comparison of groups

  4. control of extraneous variables

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Experiment conducted in Ancient Egypt

  • wanted to find out why some prisoners did not die quickly from a Cobra bite

    • the prisoners that survived longer had eaten a citron (large lemon-like fruit)

      • does eating citron cause prisoners to survive longer after the bite?

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Citron Experiment ā€” Procedure

  • any concealed citrons were confiscated when prisoners arrived

  • prisoners were fed a standard diet for several days prior to their execution

  • on execution day, prisoners were separated into 2 groups

    • one group were given a whole citron to eat before being bitten

    • the other group received nothing to eat

  • all prisoners were then bitten

  • the time it took each prisoner to due was carefully recorded

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Citron Experiment ā€” Results

  • those prisoners who were not given a citron dies within minutes after being bitten

  • those who were given a citron to eat survived for several hours before eventually dying

    • new rule that prisoners cannot eat citron before execution

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Independent Variable

  • the variable being manipulated by the researcher to test the effects on the dependent variable

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Levels of the independent variable

  • the number of conditions for a specific independent variable

    • ex; 2 levels ā€” whole citron, no citron

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Dependent Variable

  • the variable being measured by the researcher

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Controlling Extraneous Variables in an Experiment

  1. hold them constant (environmental variables)

    • not always possible (ex; body weight, healthā€¦)

  2. matching the levels of the variable across the treatment conditions (participant variables)

    • roughly the same in average health, body weight, ageā€¦

  3. random assignment of participants to groups (participant variables)

    • each participant has an equal chance of being placed in any condition

    • the ā€œgreat equalizerā€

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Categories of Extraneous Variables

  1. Environmental (procedural) variables

    • ex; prisoners diet, size of snakes, location of snake biteā€¦

  2. Participant (individual difference) variables

    • ex; height, age, weight, healthā€¦

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Experimental Group (treatment group)

  • the group that is exposed to the independent variable in a study

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Control Group (no treatment group)

  • the group that is not exposed to the independent variable

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Placebo Effect

  • change in the dependent variable due to the participant believing (or expecting) a change will occur

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Placebo Control Group

  • participants are exposed to an inert, harmless substance that is like the independent variable but has no effect

    • ex; sugar pill, saline injectionā€¦

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Manipulation Check

  • an attempt to directly measure whether your independent variable had the intended effect on your participants (i.e., that your manipulation worked)

    • useful in pilot study to ensure your procedure is successful in creating stress before conducting the actual experiment so it can be modified if needed

    • can also be done in actual experiment but should be done at the end to avoid giving clues

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Pilot Study

  • a mini study that is conducted on a few participants prior to the actual collection of data (i.e., trial run)

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Benefits to Manipulation Checks

  • if manipulation check shows participants were not stressed then youā€™ve saved yourself the time and money doing the actual experiment

  • if results are insignificant but manipulation check shows participants were stressed then you know the results are actually insignificant and its not an issue with the manipulation

  • if results are insignificant and manipulation check shows participants were not stressed then the results of the study are not accurate because the manipulation did not necessarily because there actually isnā€™t a relationship

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Laboratory Experiment

  • an experiment conducted in a laboratory setting

    • allows studies to be done under highly controlled conditions

      • high in internal validity ā€” single unambiguous result

      • low in external validity ā€” laboratory setting is too controlled and different from naturally occurring events so the results cannot be generalized to the real world

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Field Study/Experiment

  • an experiment that is conducted in a natural (real life) setting (ex; on the street, in a schoolā€¦)

    • high in external validity

    • Low in internal validity ā€” likeliness for confounding variables in an uncontrolled environment

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Mundane Realism

  • the extent to which the materials and procedures used in an experiment are similar to something that the participants might encounter in everyday life

    • the extent to which an experimental situation resembles a real-life situation

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Experimental Realism

  • the extent to which the materials and procedures used in the study have an impact on and engages the participants

    • the extent to which an experimental situation makes the participants take the experiment seriously

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Simulation Study

  • the researcher attempts to create an environment like the one of interest to study peopleā€™s behaviour in a more realistic way

    • ex; Stanford Prison Experiment

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Disadvantage of Simulation Study and Field Study

  • you lose some control over the experimental study