Data  for  simple  linear  regression practical P3/10(A-D).  Four
different sets of 11 data points (x, y) are given,  the  x-values
being the same for each set.

See "Statistics: Problems and Solutions", by E.E. Bassett et.al.,
problem 5A.3.

  x    y(A)   y(B)   y(C)   y(D)

10.0  21.26  22.40  20.70  22.94
 8.0  20.57  21.84  20.43  19.85
13.0  20.15  21.35  25.31  19.65
 9.0  22.28  22.15  20.56  20.25
11.0  21.36  22.27  20.80  22.38
14.0  22.30  20.43  21.19  23.84
 6.0  21.35  20.25  20.21  20.55
 4.0  18.81  17.66  19.90  19.53
12.0  23.63  21.90  20.95  21.55
 7.0  18.73  21.15  20.31  19.72
 5.0  20.01  19.05  20.09  20.19