Answer.....

Suppose we have six points, that is, six (x, y) ordered pairs. We randomly split off two to be in the validation (out-of-sample) data set. Here is the split: Training: (2, 4), (1, 5), (6, 1), (5, 2) Validation: (1, 6), (2, 11) Based on the training set, the fitted model (yhat) is the overall average of the training y-data. Based on this fitted model, compute RMSE for the VALIDATION data set. Enter your answer to the nearest hundredths place