Final answer:
The correct answer is B) Proportion ± margin of error. A confidence interval is a range of values that is likely to contain the true population parameter. It is used to estimate an unknown population parameter, such as the mean or proportion, based on a sample from that population.
Step-by-step explanation:
The correct answer is B) Proportion ± margin of error.
A confidence interval is a range of values that is likely to contain the true population parameter. It is used to estimate an unknown population parameter, such as the mean or proportion, based on a sample from that population. When expressing a confidence interval, the most common form is the point estimate (the sample statistic) plus or minus the margin of error. In this case, the answer is B) because a confidence interval for a proportion is expressed in the form of Proportion ± margin of error.