题目
For a two-sided confidence interval, an increase in the degree of confidence will result in:
选项
A.a wider confidence interval.
B.a narrower confidence interval.
C.no change in the width of the confidence interval.
答案
A
解析
： A is correct. As the degree of confidence increases (e.g., from 95% to 99%), a given confidence interval will become wider. A confidence interval is a range for which one can assert with a given probability 1 – α, called the degree of confidence, that it will contain the parameter it is intended to estimate. ： A正确。 随着置信程度的增加(例如，从95%到99%)，给定的置信区间将变得更宽。置信区间是一个范围，对应一定的概率1 –α，叫做置信度，它将包含要研究估计的参数。