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.

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 data points collected from a subset of a larger population for the purposes of statistical analysis.

Population Standard Deviation

The square root of the variance of a set of values in a population, measuring how spread out the values are.