After constructing a confidence intercal estimate for a popu

After constructing a confidence intercal estimate for a population mean, you believe that the intercal is useless because it is too wide. In order to correct this problem, you need to

A) increase the population size     B) increse the sample mean   C) increase the confidence coefficient     D) increase the sample size

Solution

We have to increase the sample size in order to make confiedence interval narrow and thus we can solve the problem.