Problem Solving & Data AnalysisHard
Inference from sample statistics and margin of error
Draw conclusions from sample data and understand what margin of error means for survey results.
Sample SAT Problem
A poll finds 60% support with a ±3% margin of error. What is the range of likely true support?
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Step-by-Step Solution
Range: 60% − 3% to 60% + 3% = 57% to 63%.
Key Tips from Pamela
- A larger sample size reduces the margin of error.
- Random sampling is required to generalize results to the population.
- Be careful — results from a sample can only describe the population the sample came from.
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