P57StatisticsIntermediateCalculate12 min
Calculate the Margin of Error Behind a 95% Confidence Interval
Calculate a 95% proportion interval's margin component and interpret its width.
#calculate#confidence-interval#proportions
Scenario
A survey estimates 60% support from n = 400 respondents. Use z = 1.96.
Problem statement
Calculate the approximate margin of error.
Your Task
- Calculate the standard error.
- Multiply by 1.96.
- Explain what narrows or widens the interval.
Related Concepts
Confidence intervalsStandard errorSampling
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