你好，请问这个公式是在哪个科目的哪个课件里？在数量这一科目里，到现在并没有见到过。

为什么检验值是方差相除

这题B选项不对是因为不能反推，穷举事件可能还有E3，E4...这个意思吗？

t the beginning of the year, Company P purchased 1,000 shares of Company S for $80 per share. During the year, Company S paid a dividend of $4 per share. At the end of the year, Company S's share price was $75.What amount should Company P report on its balance sheet at year-end if the investment in Company S is considered a trading security, and what amount should be reported if the investment is considered an available-for-sale security? A $75,000 for trading; $75,000 for available-for-sale B $75,000 for trading; $80,000 for available-for-sale C $80,000 for trading; $80,000 for available-for-sale

这题如果方差的分母是5，则是选A，分母是4，则是选B。这里算方差用到的是5年的全数据，为什么要除以4而不是除以5？

Selected data from Alpha Company's balance sheet at the end of the year follows: The investment in Beta Company had an original cost of $120,000. Assuming the investment in Beta is classified as available-for-sale, Alpha's total owners' equity at year-end is closest to: A $1,618,000. B $1,664,000. C $1,714,000. 老师您好，这个题我的疑问是 Beta Company had an original cost of $120,000，然而 开始是 150，000. 为什么说他们的差是 unrealized gain 那？ 这个我应该怎么判断，需要老师讲下

视频中2分30秒老师写的公式错了吧，等号左边没有除以P

题目解析的声音小到听不见

题目说每年他存入5000块钱，那么请问这5000块钱不是pmt吗？另外他是每年存入5000块，请问这怎么区分是年初存入还是年末存入呢？

这题讲解以及讲解中用的题的答案C应该是不对吧？