Confidence Interval: Definition, Formula & Example


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

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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 _____.

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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