Explain the Role of Margin of Error in Constructing a Confidence Interval
-Suppose a 95% confidence interval for turns out to be (130, 300). To make more useful inferences from the data, it is desired to reduce the width of the confidence interval. Which of the following will result in a reduced interval width
A) All of these.
B) Increase the sample size.
C) Decrease the confidence level.
D) Increase the sample size and decrease the confidence level.

Question

Quizplus · Accepted Answer

Increasing the sample size and decreasing the confidence level both reduce the width of the confidence interval, so all options listed contribute to a reduced interval width.