The effectiveness of a blood pressure drug is being investigated An experimenter finds that on average the reduction in systolic blood pressure is 43 5 mmHg millimeters of mercury for a sample of size 569 and a sample standard deviation 7 6 mmHg How much of mmHg will lower for a typical patient s systolic blood pressure after taking the drug Estimate with a 90 confidence Preliminary a Is it safe to assume that n 5 of all patients with a systolic blood pressure Yes O No b Is n 30 O No Yes Confidence Interval What is the 90 confidence interval to estimate the population mean Round your answer to one decimal place