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一选择题(选最佳答案)1 总体是指特定来源的全部个体(d)。2 标准差常用于衡量个体差异大小(d)。3 随机抽样的要点或实质是总体中的每一个体被抽中的机会相同(c)。4 在显著性检验中,P 值的含义是:因抽样误差造成数据间差异大到如此程度的概率(a)。5 用u 检验比较两均数的差异时,u 愈大,P 值愈小,愈说明有理由认为两总体均数不同(c)。6 用某法对100名正常人作检查,其中4人呈假阳性;对100名患者作检查,2人呈假阴性。该法的假阳性率是4%(c);灵敏度是98%(b);诊断指数是94(d)。
A multiple-choice question (choose the best answer) 1 Overall refers to all the individuals from a particular source (d). 2 Standard deviation is often used to measure individual differences (d). 3 The point or essence of random sampling is that each individual in the population has the same chance of being drawn (c). 4 In the significance test, the meaning of the P value is the probability that the difference between the data due to the sampling error is so large (a). 5 When using the u test to compare the differences between the two means, the larger the u, the smaller the P value, which means that there is reason to believe that the two population means are different (c). 6 One hundred methods were used to examine 100 normal persons, 4 of whom were false positives; 100 were examined and 2 were false-negative. The false positive rate for this method is 4% (c); the sensitivity is 98% (b); the diagnostic index is 94 (d).