* Data from Dept of Biology, and analyzed by the Statistical Consulting Center at
    the Virginia Polytechnic Institute and State University ; 

Obs   y      x
 1 .07739  .417  
 2 .06887 .417 
 3 .08194  .417  
 4 .07370  .833  
 5 .07388 .833 
 6 .07124  .833 
 7 .06504 1.670  
 8 .05477  1.67  
 9 .04971 3.75   
10 .06427  3.75 
11 .06130 6.25  
12 .06436  6.25  
13 .03939 6.25