Confidence Interval: Definition, Formula & Example


Choose an answer and hit 'next'. You will receive your score and answers at the end.

question 1 of 3

The amount of uncertainty of a sample estimate, like a mean or proportion, of a population is known as the _____.

Start Your Free Trial To Take This Quiz

As a member, you'll also get unlimited access to over 75,000 lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed.

Free 5-day trial
It only takes a few minutes to set up and you can cancel at any time.
Already registered? Login here for access

1. The confidence interval is expressed as the sample statistic (mean or proportion) plus or minus the _____.

2. The amount of uncertainty in a sampling method is known as the _____.

Start your free trial to access this entire page
A premium account gives you access to all lesson, practice exams, quizzes & worksheets
Access to all video lessons
Quizzes, practice exams & worksheets
Certificate of Completion
Access to instructors
Create an account to get started Create Account

About This Quiz & Worksheet

See what you know about confidence intervals with these study materials. Answer quiz questions on topics such as the term for uncertainty in a population sample estimate and how the confidence interval is expressed.

Quiz & Worksheet Goals

These key points will be considered:

  • Uncertainty in a sampling method
  • Limits of a confidence interval of 35 plus or minus 5
  • Interpreting the confidence interval in a sample problem involving finding students' average weight

Skills Practiced

  • Problem solving - use acquired knowledge to solve confidence interval practice problems
  • Critical thinking - apply relevant concepts to examine information about uncertainty in estimates and sampling methods in a different light
  • Information recall - access the knowledge you've gained regarding how we express confidence interval

Additional Learning

Learn more with the lesson named Confidence Interval: Definition, Formula & Example. As you go along, these study points will be addressed:

  • Introduction to how confidence intervals work
  • The formula for calculating confidence interval using things like t (z value) and the variance
  • Proportion in a confidence interval and the corresponding formula
  • Real-world examples of using these formulas to determine crime statistics