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 , what should you do?
A) increase the population size
B) increase the sample mean
C) increase the confidence coefficient
D) increase the sample size

Question

Quizplus · Accepted Answer

Increasing the sample size will decrease the width of the confidence interval, making it more precise and useful. Increasing the population size, sample mean, or confidence coefficient will not necessarily have an effect on the width of the interval.

After Constructing a Confidence Interval Estimate for a Population Mean