Math 143 C/E, Spring 2001
IPS Reading Questions
Chapter 2, Section 1 (pp. 102-117)

1. At the bottom of p. 104, the authors remind us of three preliminary questions one should ask when looking at a data set. How would you answer these questions for the data in Example 2.3 (p. 106)?

   
   
   
   
   
   
   
   
   
   
   

2. A scatterplot requires two quantitative variables for each individual. If one has, in addition, a third variable for each individual that is categorical, how might this be displayed on a scatterplot?

   
   
   
   
   
   
   
   

3. Which of the relationships in Examples 2.3-2.7 appear to be linear? Can any of them be categorized as positive or negative associations?

   
   
   
   
   
   
   
   
   
   
   

4. Under what conditions can we talk about a positive/negative association between a categorical variable and a quantitative one?