Variable not defined in Wrap-up quiz 7 Q11

[ArturoAmorQ]

As mentioned irl by @rouk1, in Q11 from wrap-up quiz 7 we provide a code snippet as follows:

cv = LeaveOneGroupOut()
train_indices, test_indices = list(cv.split(data, target, groups=groups))[0]

data_linear_model_train = data_linear_model.iloc[train_indices]
data_linear_model_test = data_linear_model.iloc[test_indices]

where we defined data_linear_model in the hidden solutions and therefore it's very easy to miss. We should make clear that data_linear_model refers to the data containing features used for the linear model in question 1, i.e. "speed", "speed^3", "speedsin(alpha)" and "speedacceleration".