A doctor wants to know if a medication reduces the blood pressure effectively. Six subjects have their blood pressures recorded. After twelve weeks on the medication, the same six subjects have their blood pressure recorded again. Test at the 10% significance level. Patient Before After A 161 158 B 162 159 C 165 166 D 162 160 E 166 167 F 171 169 Let the random varible Xa = X Before - XAfter. Calculate the test statistic value. (Keep 3 decimal places)