Ethan橙 · 2023年10月11日

t-table

1. FRM I
2. Quantitative

* 问题详情，请 查看题干

NO.PZ202001080100001203

问题如下：

c. What is the 99% confidence interval for $\widehat\beta$?

选项：

解释：

A 99% two-sided confidence interval uses the critical value from a one-sided test with a size of 1% (0.5% in each tail), which is 2.57. The confidence interval is then [1.37 - 2.58 * 0.065,1.37 + 2.58 * 0.065] = [1.20,1.54].

是用t-table查df=18 p=0.01么？是2.55？