PSC 41 Lecture 9: Lecture 9 - 5/4/17
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PSC 41 Full Course Notes
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Document Summary
All members of population have an equal choice. Some types of people are systematically left out. Four types of relationships between variables: positive linear relationship. Increases in one variable relate to increases in another: negative linear relationship. Increases in one variable relative to decreases in another: curvilinear relationship. Increases in one variable relative to both increases and decreases in another: no relationship. Strength of the relationship (effect size: absolute value of r indicates the strength of the relationship, value of r strength of relationship. If there is a time sequence the one that comes first if the predictor: there may be theoretical reasoning that indicates which is which. It is impossible to tell if changes in x caused changes in y (or vice versa), unless this was experimental research. Spurious relationship: x and y are each related to a third variable and not directly related to each other.
