题目
某产品的纤度 sim N(mu ,(0.05)^2) ,现抽取5根纤-|||-维测量,可得 ^2=0.03 ,在显著性水平 alpha =0.0-|||-5下,问这一天纤度总体方差是否正常?即检验-|||-_(0):(sigma )^2=({sigma )_(0)}^2=(0.05)^2 _(1):(sigma )^2neq ({sigma )_(0)}^2 ()-|||-A.由于 ({x)_(0)}^2gt ({x)_(0)}^2(x)_(2)(x)_(2)(({x)_(2))}^2((x)_(2)) 认为纤度总体方差不正-|||-常-|||-B.由于 ({x)_(0.975)}^2(5lt ({x)_(0)}^2lt ({x)_(0)}^2cdot ({a)_(1)}^2cdot (({x)_(0))}^2cdot (5) ,认为纤度总体-|||-方差正常-|||-C.由于 ({x)_(0)}^2(0)^2((x))^2lt ({x)_(0)}^2lt (x)_(0)(({x)_(0))}^2lt (x)_(0)(({x)_(3))}^2((x)_(1)) ,认为纤度总体-|||-方差正常-|||-D.由于 ({x)_(0)}^2gt ({x)_(0)}^2(0)^2(({x)_(0))}^2(5) 认为纤度总体方差不正-|||-常chi_(0.025)^2(4), 认为纤度总体方差不正&常&B. 由于chi_(0.975)^2(5chi_(0.05)^2(5), 认为纤度总体方差不正&常 end (aligned)" data-width="402" data-height="382" data-size="47946" data-format="png" style="max-width:100%">
\chi_{0.025}^2(4), 认为纤度总体方差不正\\&常\\
&B. 由于\chi_{0.975}^2(5<\chi_0^2<\chi_{0.025}^2(5), 认为纤度总体\\&方差正常\\
&C. 由于\chi_{0.975}^2(4<\chi_0^2<\chi_{0.025}^2(4), 认为纤度总体\\&方差正常\\
&D. 由于 \chi_0^2>\chi_{0.05}^2(5), 认为纤度总体方差不正\\&常
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题目解答
答案
\chi_{0.025}^2(4), 认为纤度总体方\\&差不正常。
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