Use the data in Exercise 8.7 to fit the two-term exponential model (equation 15.9) to the data from each environment separately. Use the derivative-free method and θ 1 = .2 and θ 2 = .02 as starting...

Use the data in Exercise 8.7 to fit the two-term exponential model (equation 15.9) to the data from each environment separately. Use the derivative-free method and θ₁
= .2 and θ₂
= .02 as starting values. Do you get convergence with all six data sets? Plot the response curves and the data. Do the solutions appear reasonable?