Question

Question 9 > 51 The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 85.5 for a sample of size 796 and standard deviation 9.1. 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). Answer should be obtained without any preliminary rounding.

Answer 1

And let it be the population average reduction in systolic blood pressure. Given that n=796, 0 = 85.5,5=9.) The 90% confidence interval for l is = (tief yn 1) eine) where tla, n-1)= 1:6468 85.5 + 1,6468 x 9.1 (85.5+ 0.5312) = 184.9688, 06.0312) (05.0,86.0) 85.0< 86.0 176 ) Hence