Data for problems 6.18-6.21 of Neter, 4th Edition.

A researcher wished to evaluate the relation between intermediate and
senior level annual salaries of bachelor's and master's level mathematicians
(Y, in thousand dollars) and an index of work quality (X1), number of years
of experience (X2), and an index of publication success (X3). The data is given below

   Y       X1     X2     X3

   33.2    3.5    9.0    6.1
   40.3    5.3   20.0    6.4
   38.7    5.1   18.0    7.4
   46.8    5.8   33.0    6.7
   41.4    4.2   31.0    7.5
   37.5    6.0   13.0    5.9
   39.0    6.8   25.0    6.0
   40.7    5.5   30.0    4.0
   30.1    3.1    5.0    5.8
   52.9    7.2   47.0    8.3
   38.2    4.5   25.0    5.0
   31.8    4.9   11.0    6.4
   43.3    8.0   23.0    7.6
   44.1    6.5   35.0    7.0
   42.8    6.6   39.0    5.0
   33.6    3.7   21.0    4.4
   34.2    6.2    7.0    5.5
   48.0    7.0   40.0    7.0
   38.0    4.0   35.0    6.0
   35.9    4.5   23.0    3.5
   40.4    5.9   33.0    4.9
   36.8    5.6   27.0    4.3
   45.2    4.8   34.0    8.0
   35.1    3.9   15.0    5.0