Astudy of the effects of exercise used rats bred to have high or lowcapacity for exercise. The 8 high-capacity rats had mean bloodpressure 89 mm Hg and standard deviation 9 mm Hg; the 8low-capacity rats had mean blood pressure 105 mm Hg with standarddeviation 13 mm Hg. What is the value of the two-sample t statisticfor comparing the two population means?
