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# Confidence Intervals

## Overall success rate of an interval capturing the true parameter value

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Confidence Intervals

This Concepts introduces students to using and interpreting confidence intervals.
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## Confidence Intervals

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## What are Confidence Intervals?

Explains the meaning of a confidence interval and how it is useful in estimating a population mean.
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## Statistics Confidence Interval Definition and Formula

Explains what each item in the confidence interval formula means and how to create an interval just from the formula.
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## Calculating Required Sample Size to Estimate Population Mean

Shows how you can use a formula to calculate the sample size needed in order to have a certain margin of error in the estimation of the population mean.
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## Confidence Intervals: Confidence Level, Sample Size, and Margin of Error

Uses a software to show how the entire confidence interval changes when you adjust each component inside the formula.
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• Real World Application

## Close Calls

Find out why elections are often called before all the votes have been tallied.
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• Study Guide