The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 28.8 for a sample of size 697 and standard...

The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 28.8 for a sample of size 697 and standard deviation 20.4.


Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 90% 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).


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Answer should be obtained without any preliminary rounding.