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【简答题】
假设正态总体X～N(u，1)，x 1 ，x 2 ，…，x 10 是来自X的10个观测值，要在α=0.05的水平下检验H 0 :u=0，H 1 ：u≠0，取拒绝域为 (1)求c； (2)若已知 ，求是否可以据此接受H 0 ； (3)若以 作为H 0 的拒绝域，试求检验的显著性水平α．
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