The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood prèssure is 15.5 for a sample of size 421 and standard...

Extracted text: The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood prèssure is 15.5 for a sample of size 421 and standard deviation 11.6. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 99% confidence level). Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). < u="">< answer="" should="" be="" obtained="" without="" any="" preliminary="">