Topic: Confidence Intervals for Proportions

Worked Interval for a Rare Health Outcome

Worked Interval for a Campus Poll

Why Sample Proportions Vary

When the Wald Interval Fails Near a Boundary

What a Confidence Level Means

Using Pilot Data to Plan Sample Size

Rounding Sample Size and Checking Precision

Reporting a Confidence Interval for a Proportion

Reading Proportion Interval Software Output

Planning Sample Size for a Desired Margin of Error