The Confidence Interval Is

The confidence interval is

A) a measure of the variation in responses for continuous measures.
B) the level of error related to the probability of rejecting the null hypothesis.
C) a counting of the number of cases that fall into the various response categories.
D) a projection of the range within which a population parameter will lie at a given level of confidence based on a statistic obtained from an appropriately drawn sample.
E) the arithmetic mean value across all responses for a variable.