The best estimate for the age of the plant at 19 inches tall height is; 28 months
We are given the time in months as;
1, 2, 3, 4, 5, 6 months.
We are also given the corresponding heights for those months respectively as; 18.2, 18.21, 18.33, 18.42, 18.46, 18.54
Now, when we punch those values into an online regression calculator, we arrive at the regression equation as;
y = 18.001 + 0.3ln(x)
We want to find the best estimate for the age of the plant at 19 inches tall height. Plugging in 19 for x in the regression equation gives;
y = 18.001 + 0.3ln(19)
Solving theis gives; y = 28 months
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