4.(1)设样本x1,x2,···,X6来自总体N(0,1), =(({X)_(1)+(X)_(2)+(X)_(3))}^2+-|||-(({X)_(4)+(X)_(5)+(X)_(6))}^2, 试确定常数C使CY 服从x^2分布.-|||-(2)设样本X1,X2,··,5来自总体N(0,1), =dfrac (C({X)_(1)+(X)_(2))}({({{X)_(3)}^2+({X)_(4)}^2+({X)_(5)}^2)}^1/2} 试确-|||-定常数C使Y服从t分布.-|||-(3)已知总体 approx t(n), 求证 ^2approx F(1,n),

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