From your true model, you will have the mean and standard deviation based on the size of the population, N.
Using the true model, estimated model, and standard deviation, you will get the confidence limit.
Whether it's serious or not, that will depend on the resulting percent of confidence, of which is the function of population and the standard deviation.
Note: I don't know what you are given, but I must assume that denotes possible error, i=1,2,3,...N
Whether it denotes errors or not, you have a 3-dimensional center points and moments, where each point is ( )