CompTIA Data+ (DA0-001) — Question 107

Which of the following best describes a 95% confidence interval?

Answer options

• A. There is a 95% probability that the population mean lies within the stated interval.
• B. A stated range may contain 95% of the population mean, 95% of the time.
• C. A set of ranges contains the population mean with 95% certainty.
• D. A range contains 95% of the population mean.

Correct answer: A

Explanation

The correct answer, A, accurately reflects the definition of a 95% confidence interval, which indicates that there is a 95% chance the true population mean falls within the calculated range. Options B, C, and D misinterpret the concept by suggesting that the interval relates to the population mean itself rather than the probability of the population mean being within the interval.