AP Statistics Quiz
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INFERENCE FOR CATEGORICAL DATA: PROPORTIONS
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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 pX−pYp_{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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