Final answer:
A confidence interval is an interval estimate for an unknown population parameter. It represents a range of values within which we estimate the true value of the population parameter lies.
Step-by-step explanation:
A confidence interval is an interval estimate for an unknown population parameter. It represents a range of values within which we estimate the true value of the population parameter lies. The confidence level determines the level of certainty we have in the estimate. For example, a 95% confidence interval means that we are 95% confident that the true value of the parameter falls within the interval.