题目
2.单选题-|||-设(X1,X2,···,Xn)为来自正态总体N(μ,σ^2)-|||-的样本, 是样本均值,S2为样本方差,-|||-则统计量-|||-.dfrac (overline {overline {X)-mu }}(S/sqrt {n)}- .-|||-() .-|||-A N(μ,σ^2)-|||-B N(0,1)-|||-C .t(n-1)-|||-D .^2(n-1)
题目解答
答案
】由题意可知$\dfrac{\overline{x}-\mu}{s/\sqrt{n}}\sim t(n-1)$答案选DD
D
D