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3 cards from this section. Quick, good the night before a test.
What is a pie chart used for?
Think about how pie slices represent parts of a total.
Define 'margin of error'.
Consider how confident we are in the data.
What does a pie chart show?
Think about pie slices!
The margin of error indicates reliability.
Consider what margin of error represents.
A poll conducted shows that 42% of 200 voters favor Candidate A. If the margin of error is 5%, what can be inferred about the true percentage?
Subtract and add the margin of error to the reported percentage.
If a pie chart shows that 25% of voters prefer Candidate B from a total of 400 surveyed, how many voters does that represent?
Use the formula: (percentage/100) * total voters.
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