Question: 4. Consider the matrix and vector 1 X = 1 0 and b = 2 Note that X is defined identically in the preceding problems.

4. Consider the matrix and vector 1 X = 1 0 and b = 2 Note that X is defined identically in the preceding problems. a) Make a sketch of the orthonormal bases U and the columns of X in three dimen- sions. b) Use U and the result of the previous problem to compute the LS estimate b = X(X"X)-'X"b

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