Instructor: Cowles 
                         Spring 2006, Homework 12 

Due:  Fri. 05/05

Textbook problems:  I.40 (p. 168), 21.24 (part b only), 21.25, 21.34* 

    Note:  The answer to 21.24 (a) is that the sample size is so huge
           that even a very small non-zero value of the sample slope would
           lead to statistical significance.
  
   *21.34  The data are on the course web page as "perch.dat."  Use SAS;
    then write answers to  all parts of the question.