NO.PZ2022123001000096
问题如下：
The confidence interval is most likely to be:
选项：
A.wider as the point estimate increases B.narrower as the reliability factor decreases C.wider as the sample size increases解释：
A confidence interval for a parameter = Point estimate ± Reliability factor × Standard error. For example, the reliability factors for confidence intervals based on the standard normal distribution are 1.65 for 90% confidence intervals and 1.96 for 95% confidence intervals. For a given pointestimate and standard error, the confidence interval will be narrower with a lower reliability factor.
按照这个公式：A confidence interval for a parameter = Point estimate ± Reliability factor × Standard error
A为什么不对呢
