If a set of paired data gives the indication that the regression equation is of the form μY|x = α · βx, it is customary to estimate α and β by fitting the line
to the points {(xi, log yi);i = 1, 2, ... , n} by the method of least squares. Use this technique to fit an exponential curve of the form 
= 
· 
x to the following data on the growth of cactus grafts under controlled environmental conditions:
