AP®︎ Statistics (pre-2026): Topic 6.9 Flashcards

Master key terms and definitions for Topic 6.9 of AP Statistics (pre-2026) – Justifying a Claim Based on a Confidence Interval for a Difference of Population Proportions to help you prep for quizzes and the AP exam.

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Term

Interpretation of a Confidence Interval for p1 - p2

Definition

We are C% confident the true difference in population proportions lies between the interval bounds.

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Interpretation of a Confidence Interval for p1 - p2
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We are C% confident the true difference in population proportions lies between the interval bounds.

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Repeated Sampling Meaning of C% Confidence
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In many repeated random samples, about C% of such intervals capture the true difference.

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Population Proportions vs. Sample Proportions
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The interval estimates the difference in true population proportions, not the observed sample proportions.

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Context in Confidence Interval Interpretation
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The interpretation must name the populations represented by the samples and the variable being compared.

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Using a Confidence Interval to Test a Claim About p1 - p2
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Check whether the claimed value, usually 0, falls inside the interval.

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Using a Confidence Interval to Judge a Difference in Proportions
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If 0 is excluded, a difference is supported; the sign shows which proportion is larger.

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