这里的90% confidence interval是无效信息吗？

嗨，努力学习的PZer你好：

可以算是无效信息，计算用不到，Expected (external funds) = ($1,400,000 + $400,000) / 2 = $900,000.

题干中涉及这个计算的内容就是下面两句话，这个计算其实是“看图说话”

Verdue estimates AMLAIC annual operating expenses to be $1.8 million. 

V同学预估A年度支出总额是1.8M

The ESU Office of Sponsored Research estimates a 90% confidence interval for the mean value of annual research grant funds from outside sources to be $0.4 to $1.4 million. 

ESU 研究办公室估计，来自外部来源的年度研究资助资金的平均值为 0.4 至 140 万美元（ 90% 的置信区间）。

0.4m就是400k

解答中AMLAIC’s total funding requirement of $1,800,000 is reduced by external funds, with expected value at the middle of the confidence interva这句话的意思就是

估计的0.4到140万美元取一个中间值，就是($1,400,000 + $400,000) / 2 作为estimate

至于 confidence interval就是指0.4到140的这个区间

----------------------------------------------
努力的时光都是限量版，加油！