We could narrow a 95 percent confidence interval by:
A)using 99 percent confidence.
B)using a larger sample.
C)raising the standard error.

Question

Quizplus · Accepted Answer

To narrow a 95 percent confidence interval, we need to decrease the margin of error, which is directly related to sample size. Increasing sample size allows for more precise estimation of the population parameter and decreases the uncertainty of the interval. Using a larger sample reduces the standard error, while using a smaller sample would increase it. Using a higher confidence level, such as 99 percent, would actually widen the interval and increase the margin of error. Raising the standard error would also increase the margin of error and widen the interval. Therefore, the best choice is to increase the sample size.

We Could Narrow a 95 Percent Confidence Interval By