Which Statement Best Describes a Parameter

Multiple Choice

Which statement best describes a parameter?

A) A parameter is a level of confidence associated with an interval about a sample mean or proportion.
B) A parameter is an unbiased estimate of a statistic found by experimentation or polling.
C) A parameter is a sample size that guarantees the error in estimation is within acceptable limits.
D) A parameter is a numerical measure of a population that is almost always unknown and must be estimated.