methods1 - Like height and weight: As heights increase,...

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Two Basic Approaches to Doing Research in Psychology    Correlational Research   Experimental Research Both approaches are based on the concept of a “variable”. Basically, a variable is anything that can vary, like your                                    height, weight, age, address, and course  schedule. It has two aspects:  an overall dimension or continuum, and a  series of “levels” or subdivisions.
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Nature of a Variable It’s like a ruler. .. Not this kind of ruler: This kind: The ruler as a whole is the variable.  We can  name it “length”. The inch marks are the levels of the variable.
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Nature of a Correlation A correlation is a relationship between two  variables where changes in one variable go  along with changes in the other variable.
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Unformatted text preview: Like height and weight: As heights increase, weights also tend to increase. Two Basic Kinds of Correlations: Positive: the variables change in the same direction, like height and weight. Negative : the variables change in opposite directions, like: as class absences increase, grades tend to decrease. Positive and Negative The Coefficient of Correlation A value of 0.00 means there is no relationship between the variables. A value of +1.00 means a perfect, positive correlation. Weaker positive correlations have values higher than .00 but lower than +1.00. A value of -1.00 means a perfect, negative correlation. Weaker negative correlations have values higher than 1.00 but lower than 0.00. a measure of the strength of a correlation...
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This note was uploaded on 01/12/2011 for the course PSY 270 taught by Professor Hall during the Spring '05 term at University of Phoenix.

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methods1 - Like height and weight: As heights increase,...

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