jiulaiyichi 发表于 2012-5-3 19:36 
1.作一条曲线凸向到期价值
2.预期上升
另外,还有一道题要请教:
a drug trial gives the result that the drug works better than the placebo, with 95% confidence. What exactly does this statement mean? What further assumptions are needed to be able to deduce that the probability of the drug working is actually 95%?
谢谢。