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AP Statistics Flashcards: Justifying Claims Based On Confidence Interval

Study Justifying Claims Based On Confidence Interval in AP Statistics with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

Find the critical value for a 99% confidence interval using the standard normal distribution.

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ANSWER

2.576. For 99% confidence, α=0.01\alpha = 0.01, so Z0.005=2.576Z_{0.005} = 2.576.

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AP Statistics: Inference for Categorical Data: Proportions

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This deck focuses on Justifying Claims Based On Confidence Interval, giving you a quick way to review the definitions, rules, and examples that matter most for AP Statistics.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 48Practice questions for this set
Two brands of batteries are tested for the proportion that last at least 10 hours. A 95% confidence interval for the difference in proportions, defined as p_{X} - p_{Y} (Brand X minus Brand Y), is (−0.20,−0.05)(-0.20, -0.05). A consumer claims, "Brand X has a lower proportion lasting at least 10 hours than Brand Y." Is the claim supported by the confidence interval?
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