The EXPERIMENTAL REGION is the range of values of the independent variables in the data used to estimate the regression model.
According to the statement
There is a region where the range of values of the independent variables in the data used to estimate the regression model.
AND
Those region is called EXPERIMENTAL REGION
So, Experimental region is called a those region in which the region within which we can make valid predictions and doesn't go outside of the bounds of the data we were provided.
So, The EXPERIMENTAL REGION is the range of values of the independent variables in the data used to estimate the regression model.
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