Please help with homework problem.

Ten healthy adult subjects were asked to walk on a treadmill while connected to monitors. One of two kinds of disturbances was applied during the walk, and the number of steps until adaptation was recorded. Each subject experi- enced both kinds of disturbance, in random order. Here are the summary data for these 10 subjects: Page 3 N Mean StDev SE Mean Disturbance A 10 7.320 2.10016 0.66413 Disturbance B 10 5.170 1.86073 0.58842 Difference A-B 10 2.150 2.68711 0.84974 Find a 95% condence interval for [J (I A (0.48, 3.82) o (0.23.4.0?) A (1.15. 3.15) A None of the above