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Advanced Placement (AP), 12.03.2021 17:30 tjuicy1

a quality control engineer is testing the battery life of a new smartphone. The company is adverting that the battery lasts 24 hours on a full charge, but the engineer suspects that the battery life is actually less than that. They take a random sample of 50 of these phones to see if their average battery life is significantly less than 24 hours

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