Question: Consider the values of x shown below: x = 1 0. , 0 1 70 1 25 1 20 1 45 1 85 1 60

Consider the values of x shown below:

x = 1 0. , 0 1 70 1 25 1 20 1 45 1 85 1 60 1 50 1 95 2 00 . ,. ,. ,. ,. ,. ,. ,. ,.

Suppose that we wish to fi t a second - order model using these levels for the regressor variable x. Calculate the correlation between x and x2

. Do you see any potential diffi culties in fi tting the model?

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