Chapter_7_-Experimental_Research

Chapter_7_-Experimental_Research - PSYC 310 Chapter 7...

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Experimental Research Experimental Research PSYC 310 – Chapter 7 PSYC 310 – Chapter 7
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Experimental Research Manipulation of one variable (IV) to observe its effect on another variable (DV) while holding other potential influences constant. Most powerful of the research methods – high constraint. The main goal of an experiment is to arrive at a causal explanation .
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Experimental Research 2 basic types: Between Groups Within Groups
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Between Groups Design Between Groups Design Two or more groups are formed at random from a pool of subjects. (independent groups) Each group receives a different experimental treatment (value of the IV) and the groups are compared. Group 1 Group 2 Results Results
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Within Subjects Design Within Subjects Design There is only one treatment group and each subject is given all values of the IV. The comparison is made between scores obtained at different levels of the IV for same subjects . Group 1 Results at T1 Results at T2
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Experimental Research 4 basic elements: manipulation of the IV measurement of the DV comparison control
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Experimental Research 2 critical components: independent and dependent variables experimental and control groups
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Variables Independent variable: Is manipulated by the experimenter and can be thought of as the cause . Typically, there are at least two levels of the IV. Each level corresponds to a treatment condition. When there is more than one IV in a study, it is called a factorial design .
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Variables Dependent variable: The variable in which you are trying to effect some sort of change when you are manipulating the independent variable. The DV is measured for each level of the IV and then compared across conditions. When the study has more than one DV, it is called a multivariate study .
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Groups Experimental group: Control group: The participants in your experiment exposed to the manipulation. A group in your experiment that is not exposed to the manipulation and that is used for comparison purposes.
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Experimental Conditions   IV = music present - T absent - C DV = math perf. change no change Does exposure to music (IV) improve math performance (DV) ?
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Experimental Conditions Does exposure to music (IV) improve math performance (DV) ? IV DV 1 2 4 3 Music Improvement No music Improvement Music No improvement No music No improvement   Present- present cell
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1 2 4 3 Music Improvement No music Improvement Music No improvement No music No improvement   20 80 40 10 1 2 4 3 Music Improvement No music Improvement Music No improvement No music No improvement 20 80 90 10 Music: 20% No music: 20% Music: 20% No music: 10%
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  Is Prozac (IV) and effective treatment for depression (DV) ? IV = Prozac
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This note was uploaded on 04/29/2010 for the course PSYCH 310 taught by Professor T.bianco during the Winter '10 term at Concordia Canada.

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Chapter_7_-Experimental_Research - PSYC 310 Chapter 7...

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