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Case Study
An indepth study of one individual

Causality
A relationship such that variation in on e dimension produces variation in another

Clinically significant
An association large enough to have some practical importance

Correlation
A relationship in which two variables or dimensions covary when measured repeatedly

Correlation coefficient
a numeric index of the degree of correlation between to variables.

Dependent variable
The variable measured as the outcome of an experiment the effect in a causeeffect relation

Descriptive statistics
Statistics used to describe or characterize some group.

Experimental Group
The holding constant of variables that are not being manipulated

Experimental method
The method in which one variable is manipulated to test for causal influence on another variable

Experimental personality research
A study involving a personality factor and an experimental factor

Generality (generalizability)
The degree to which a conclusion applies to many people

Independent Variable
The variable manipulated in an experiment, tested as the cause in a causeeffect relation.

Inferential statistics
Statistics used to judge whether a relationship exists between variables

Interaction
S ginding in which the effect of one predictor variable differs depending on the level of another predictor variable

Main effect
A finding in which the effect of one predictor variable is independent of other variables.

Multifactor Study
A study with two (or more) predictor variables

Personology
The study of the whole person, as opposed to studying only one aspect of the person

Practical significance
An association large enough to have practical importance.

Random assignment
The process of putting people randomly into groups of an experiment so their characteristics balance out across groups

Statistical significance
the likelihood of an obtained effect occurring when there is no true effect

Thirdvariable problem
The possibility that an unmeasured variable caused variations in both of two correlated variables

Variable
A dimension along which two or more variables exist

