A group of five individuals with high blood pressure were givena new drug that was designed to lower blood pressure. Systolicblood pressure was measured before and after treatment for eachindividual, with the following results:
Subject | Before | After |
1 | 172 | 145 |
2 | 164 | 132 |
3 | 168 | 129 |
4 | 158 | 135 |
5 | 183 | 145 |
Let ?X represent the population mean before treatment and let ?Yrepresent the population mean after treatment. Find a 90%confidence interval for the difference ?D=?X??Y . Round the answersto three decimal places.
The 90% confidence interval is
