STAT 2080 Lecture Notes - Lecture 6: Laundry Detergent, Linear Map, Scatter Plot

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Relationship between 2 quantitative variables on the same individual. Pattern = form, direction, and strength of the relationship: form linear relationship, direction positive or negative association, strength determined by how closely the points follow a clear form. Always look for overall pattern and standard deviations. Two variables are positively associated if: large values of 1 variable are found with large values of the other variable, small values of 1 variable are found with small values of the other variable. Two variables are negatively associated if: large values of 1 variable are found with small values of the other variable, small values of 1 variable are found with large values of the other variable. There are many curved relationships: we can apply a transformation to make the relationship more linear. Log transformation: used only for variables with + values . We cannot assume that the relationship extends beyond the use natural logarithms.

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