有关置信区间的计算In a finance course at a business school,6 students

学习时间:2026-04-07 20:07:20 阅读：6758

有关置信区间的计算In a finance course at a business school,6 students are randomly selected.Their mean score on the final exam is 75,with standard deviation 8.6个学生随机抽取出来,期末平均成绩是75,方差是8What is the 95% confidence interval for the average class score on the final?在95％的自信度下,全班的平均成绩是?[66.6,83.4][67.6,82.4][68.6,81.4][71.7,78.3]我的算法就是上限＝75＋1.96*8／根号6＝81.4选c,但答案批我错,是不是答案错了?