Question: 7.5. (Sec. 7.2) X2-distribution. Use Problem 7.4 to show that if Yl''' Yn are independe?tly dist.ribut~d, each according to N(O, 1), then U = r.:=

7.5. (Sec. 7.2) X2-distribution. Use Problem 7.4 to show that if Yl'"'' Yn are independe?tly dist.ribut~d, each according to N(O, 1), then U = r.:= 1 Y; has the density U,"-I

e- ,Uj[2,nntn)], which is the x2-density with n degrees of freedom.

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