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Tip: Remember how we specified the radius to range from 1 to 2.5 inches to create the Response Surface? Well we now know that the optimized radius should be around 1.45 inches so no need to have that big of a of range anymore. For a second round of optimization (not done in this tutorial), it would be a good idea to go back in Design of Experiments and change to the lower and upper bound bounds to be, say 1.4 and 1.5 inches respectively. A smaller range will give you a more accurate response surface which will help you optimize the radius further.

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