劉同學(xué)
2018-05-21 20:23ABC Company sells computer parts by mail. A sample of 25 recent orders showed the mean time taken to ship out these orders was 45 hours with a sample standard deviation of 12 hours. Assuming the population is normally distributed, the 99% confidence interval for the population mean is: A 45 ± 2.80 hours. B 45 ± 6.98 hours. C 45 ± 6.71 hours. 是不是得有表才能做?2.797是怎么來(lái)的?
所屬:CFA Level I 視頻位置 相關(guān)試題
來(lái)源: 視頻位置 相關(guān)試題
1個(gè)回答
銀礦石助教
2018-05-22 17:30
該回答已被題主采納
同學(xué)你好,是的,需要有表。
