单选题 Which of the following would result in a wider confidence interval?
【正确答案】 A
【答案解析】A higher degree of confidence (e. g. 99% instead of 95% ) would require a higher reliability factor (2.575 instead of 1.96 assuming a normal distribution). A wider confidence interval corresponds to a lower alpha significance level and the point estimate does not affect the width of the confidence interval.