置信系数(显著性水平)为95%和9%的置信区间及其上下限 置信系数(显著性水平):又称犯第一类错误的概率 95% X-2052 X+2052 X+2.771 Fig 5-2 (a)95% and(b )99% confidence intervals for ux for 27 d f. 5-95-9 置信系数(显著性水平)为95%和99%的置信区间及其上下限 置信系数(显著性水平):又称犯第一类错误的概率 Fig 5-2 (a) 95% and (b) 99% confidence intervals for μx for 27 d.f