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 population size
B) increase the sample mean
C) increase the confidence coefficient
D) increase the sample size
E) decrease the sample size

Confidence Interval

A range of values, derived from the sample data, that is likely to contain the value of an unknown population parameter with a certain degree of confidence.

Sample Size

The number of observations or datapoints collected in a subset of a larger population.

Confidence Coefficient

The degree of certainty or probability (expressed as a percentage) that the confidence interval contains the true parameter value.