You want to find the predicted value of heat, so you leave the heat value empty.
4.
Figure 10.6 The Inverse Prediction Specification Window
6.
Figure 10.7 Inverse Prediction Report
When soak is 2, the predicted value of heat for which there is a 90% chance of an ingot being ready to roll is 39.60 with a 95% confidence interval from 32.09 to 57.29. When soak is 2, the predicted value for heat for which there is an 80% chance of an ingot being ready to roll is 49.49 with a 95% confidence interval from 39.90 to 78.71.

Help created on 7/12/2018