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The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average,...

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The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 48.7 for a sample of size 981 and standard deviation 17.6. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 80% confidence level).

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