Problem-Solving and Data AnalysisEasyInterval from an estimate and a margin of error
Problem-Solving and Data Analysis practice question
A poll estimates that 45% of a town's residents support a new park, with a margin of error of 3 percentage points. Which interval is the poll's range of plausible values for the true percentage?
- A. 42% to 48%Correct
- B. 45% to 48%
- C. 42% to 45%
- D. 15% to 75%
Answer: A. 42% to 48%
The margin of error is added and subtracted: 45 ± 3.
Why the other answers are wrong
- B. 45% to 48%
- Only adds the margin.
- C. 42% to 45%
- Only subtracts the margin.
- D. 15% to 75%
- Uses 30 instead of 3.
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