AP®︎ Statistics (pre-2026): Topic 7.7 Flashcards

Master key terms and definitions for Topic 7.7 of AP Statistics (pre-2026) – Justifying a Claim About the Difference of Two Means Based on a Confidence Interval to help you prep for quizzes and the AP exam.

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Term

Interpretation of a Confidence Interval for mu1 Minus mu2

Definition

We are C% confident the true population mean difference lies between the interval endpoints in context.

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Interpretation of a Confidence Interval for mu1 Minus mu2
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We are C% confident the true population mean difference lies between the interval endpoints in context.

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Repeated Random Sampling Meaning of C% Confidence
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In repeated random sampling, about C% of such intervals would capture the true population mean difference.

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Context in Confidence Interval Interpretation
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An interpretation must name the samples and the populations they represent in the problem setting.

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Null Claim for Comparing Two Population Means
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The default claim is that the true population mean difference equals 0.

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Width of a Confidence Interval and Sample Size
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Holding other factors constant, larger sample sizes produce narrower intervals for the population mean difference.

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Using a Confidence Interval to Evaluate a Claim About Two Means
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A claim is supported when its stated difference is inside the interval, including 0 for no difference.

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