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5 Cards in this Set

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Examine scatterplot of bivariate data
If relationship exists then we look for
Direction,Form,Strength.
Direction
Positive: If X increases as Y increases
Negative: If X increases and Y decreases ot vice versa.
Form
Linear: Straight line or not
Non-linear: Curvature or Quadratic(u shaped) or cubic or exponenial(half u)
Strenght of relationship
Strong: concentrated around form
Weak: points loosely scattered about form
Adding a categorical variable
The relation b/w the individual categorical variables is stronger than the cumulative analysis of all categorical variables together. e.g of hot dogs in CD.