NO.PZ202001080100001203
问题如下：
c. What is the 99% confidence interval for ?
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].
df是不是n-2=18?