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Unformatted text preview: Chapter 2- Looking at Data we often care about the relationship between two variables to study the relationship, we measure both variables on the same individuals Two variables measured on the same individuals are associated if some values of one variable tend to occur more often with some values of the second variable than with other values of that variable. EX- taller people tend to be heavier EX- people who smoke a lot of cigarettes tend not to live as long as those who do not Is your purpose to explore the nature of the relationship between the two variables? Is your purpose to try to show that one variable can explain variation in the other? response variable- measures an outcome of a study explanatory variable- explains or causes change in the response variables •set values and see how variables respond EX- drinking beer and level of alcohol in blood •observe values from data set One may not always be looking for explanatory and response variables....
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- Spring '08
- response variables, SAT score, Explanatory Variables scatterplots, categorical explanatory variable