From the Fit statistic datas for table 7, the Predicted R² of 0.9707 is in reasonable agreement with the Adjusted R² of 0.9910 with a difference less than 0.2. Adequate Precision measures the signal to noise ratio. A ratio greater than 4 is desirable, thus having a ratio of 50.349 indicates an adequate signal which indicates that this model can be used to navigate the design space.