老师怎么解释A这个选项

老师为什么该题违反了A

这题答案是不是选A啊？答案显示选B

A net inflow of funds are generated in an arbitrage transaction: A At the end of the holding period. B At the start of the holding period. C Throughout the holding period. 这个net inflow，指的是套利所产生的收益吧，肯定是结束的时候才有net，才能确认到底有没有net

A perfectly hedged position consisting of a derivative and its underlying asset will most likely yield a return that is: A greater than the risk-free rate. B smaller than the risk-free rate. C equal to the risk-free rate. 如果仅仅等于 risk-free rate，为何还要套利呢？

A hypothesis test has a p-value of 1.96%. An analyst should reject the null hypothesis at a significance level of: A 6%, but not at a significance level of 4%. B 3%, but not at a significance level of 1%. C 4%, but not at a significance level of 2%. 这题怎么想？

Investor believes that the mean price of houses in the area is greater than $135,000. A random sample of 25 houses in the area has a mean price of $139,750. The population standard deviation is $24,000. At a 1% level of significance, we should: A Reject the null hypothesis. B Fail to reject the null hypothesis. C Neither rejects nor fails to reject the null hypothesis. 这题答案是否错误？1%对应的应该是2.58吧？

Using the above data, an analyst is trying to test the null hypothesis that the population variances are equal（） against the alternative hypothesis that the variances are not equal （）at the 5% level of significance. The following table provides the F-distribution. Which of the following statements is most appropriate? The critical value is: A 9.60 and do not reject the null. B 7.15 and do not reject the null. C 6.39 and reject the null. 老师这种题是否需要掌握？

Which of the following will lead Inventories to rise? A inventory—sales ratios are high. B economic activity begins to rebound. C inventory—sales ratios are low. 这题什么原理？

ABC 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是怎么来的？