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Margin of Error

Margin of Error. Discuss with a partner the difference between a POPULATION & a SAMPLE; Give three examples of each… POPULATION SAMPLE 1. 1. 2. 2. 3. 3. Recap…. A value that tells the uncertainty in our estimate.

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Margin of Error

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  1. Margin of Error

  2. Discuss with a partner the difference between a POPULATION & a SAMPLE; Give three examples of each… POPULATION SAMPLE 1. 1. 2. 2. 3. 3. Recap…

  3. A value that tells the uncertainty in our estimate. • A measure of how close we believe the SAMPLE proportion is to the POPULATION proportion. • Formula used to predict MOE with 95% confidence ≈ 1 √n What is a Margin of Error (MOE)?

  4. During the week of 8/10/01, CNN conducted a poll asking 1000 Americans whether they approve of President Bush’s performance as President. The approval rating was 57%. In their next poll conducted during the week of 9/21/01, CNN conducted the same poll asking 100 Americans whether they approve of President Bush’s performance as President. The approval rating was 90%. Example

  5. Why the difference in ratings? • Find the MOE in the August poll. • Find the MOE in the September poll. • Explain why the MOE for the August poll in less than that in September.

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