设总体 sim N(0,2) ,(X1,X2,···,X6)是来-|||-自总体X的样本,若 dfrac (a({X)_(1)+(X)_(2))}(sqrt {{sum )_(i=3)^6({X)_(2)}^2}} 服从t分布,-|||-则a=-|||-A3-|||-B sqrt (2)-|||-C 0-|||-D1

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