The effectiveness of a blood-pressure drug is being Investigated. An experimenter finds that, on average, the reduction In systolic blood pressure Is 22.8 for a sample of size 747 and standard devlation 13.7. Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 95% 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).