The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 21.4 mmHg (millimeters of mercury) for a sample of size 334 and a sample standard deviation 11.7 mmHg. How much of mmHg will lower for a typical patient's systolic blood pressure after taking the drug? Estimate with a 98% confidence. Preliminary: Is it safe to assume that �≤5% of all patients with a systolic blood pressure? No Yes Is �≥30 ? No Yes   Confidence Interval:What is the 98% confidence interval to estimate the population mean? Round your answer to one decimal place.

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