With the given polynomial, such as y=x3-6x2+5x-3, [-1, 1] intervals of 20 sets of data (Xi, Yi, i=1,2,... , n), and then add the random interference in Yi (available on rand (-5,5) uniformly distributed random number). Please (1) on the Xi and add a stochastic disturbance for Yi 3 polynomial fitting, compared with the original coefficient.

674.txt

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