George Box, a famous statistician, once said, "All models are wrong, but some are useful.” What did George Box mean by this statement?

Answer:

A model is an estimate or approximation of a data set. In the real world, there are too many variables to know exactly what will happen. However, if a model is a good fit, then it can be used to make predictions about what will happen. With a useful model, a predicted value should be a good estimate of an observed value.