Samples and Margin of Error

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What does SRS stand for?

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Simple Random Sample

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CCSS.HSS.IC.B.3

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What is the margin of error?

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The margin of error is a measure of the uncertainty in survey results, indicating the range within which the true population parameter is expected to fall.

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CCSS.HSS.IC.B.4

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How do you calculate the confidence interval using margin of error?

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Confidence Interval = Sample Proportion ± Margin of Error.

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CCSS.HSS.IC.B.4

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What is a population in statistics?

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A population is the entire group of individuals or instances about whom we hope to learn.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

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What is a sample in statistics?

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A sample is a subset of the population selected for analysis.

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CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

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How do we reduce variability in survey results?

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Increase sample size.

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What is the purpose of random sampling?

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To ensure that every individual has an equal chance of being selected, which helps to eliminate bias.

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CCSS.HSS.IC.B.3

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What is the significance of a 95% confidence level?

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A 95% confidence level means that if we were to conduct the survey multiple times, 95% of the confidence intervals calculated would contain the true population parameter.

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CCSS.HSS.IC.B.4

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If a survey reports 80% with a margin of error of 5%, what is the confidence interval?

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75% - 85%.

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CCSS.HSS.IC.B.4

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What does it mean if a survey has a margin of error of 2%?

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It means that the true population parameter is expected to fall within 2 percentage points of the reported statistic.

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CCSS.HSS.IC.B.4