Problem-Solving and Data AnalysisHardMargin of error from an interval
Problem-Solving and Data Analysis practice question
A poll reports that the percent of voters who support a proposal is 48% to 54%, an interval formed by adding and subtracting the margin of error from the sample estimate. What is the margin of error, in percentage points?
Answer: 3
The interval is centred at 51% and extends 3 points either side.
Common wrong answers
- If you answered 6
- 6 is the full width of the interval.
- If you answered 48
- 48 is the lower end.
- If you answered 51
- 51 is the estimate.
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