After constructing a confidence interval estimate for a population mean,you believe that the interval is useless because it is too wide.In order to correct this problem,you need to:
A)increase the sample size.
B)increase the population standard deviation.
C)increase the level of confidence.
D)increase the sample mean.

Question

Quizplus · Accepted Answer

Increasing the sample size will decrease the width of the confidence interval. This is because the standard error of the mean (which is used to calculate the confidence interval) is inversely proportional to the sample size. Therefore, increasing the sample size will make the estimate more precise and reduce the width of the confidence interval. Increasing the population standard deviation, level of confidence, or sample mean will not necessarily decrease the width of the confidence interval.

After Constructing a Confidence Interval Estimate for a Population Mean,you