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Confidence intervals

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Confidence intervals and margin of errorConfidence interval simulationInterpreting confidence level exampleInterpreting confidence levels and confidence intervals
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Confidence interval exampleMargin of error 1Margin of error 2Conditions for valid confidence intervalsConditions for confidence intervals worked examplesReference: Conditions for inference on a proportionCritical value (z*) for a given confidence levelExample constructing and interpreting a confidence interval for pInterpreting a z interval for a proportionDetermining sample size based on confidence and margin of error
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Introduction to t statisticsSimulation showing value of t statisticConditions for valid t intervalsReference: Conditions for inference on a meanExample finding critical t valueExample constructing a t interval for a meanConfidence interval for a mean with paired dataMaking a t interval for paired dataInterpreting a confidence interval for a meanSample size for a given margin of error for a mean
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T-statistic confidence intervalSmall sample size confidence intervals

About this unit

Confidence intervals give us a range of plausible values for some unknown value based on results from a sample. This topic covers confidence intervals for means and proportions.