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Comparisons of predicted values and observed values.
| Polymer | Coded level | Actual level | Responses | Hardness | Swelling index |
|---|---|---|---|---|---|
| Predicted values | 6.002 | 228.18 | |||
| Observed values | 6 | 226 | |||
| Polyox WSR205 | 1 | 180 | Standard deviation | 0.2359 | 3.098 |
| Xanthan gum | −1 | 45 | Standard error mean | 0.2049 | 2.6919 |
