If a set of paired data gives the indication that the regression equation is of the form µ_Y|x = α ∙ β^x, it is customary to estimate a and β by fitting the line

to the points {(x_i, logy_i); i = 1, 2, . . . , n} by the method of least squares. Use this technique to fit an exponential curve of the form  =  ∙ β^^x to the following data on the growth of cactus grafts under controlled environmental conditions:

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log y-log α +x-log Weeks after Height grang inches) 2.0 2.4 5.1 7.3 9.4 18.3