An obstacle course was set up on a campus, and10 volunteers were given a chance to complete it while they were being timed. They then sampled a new energy drink and were given the opportunity to run the course again. The "before" and "after" times in seconds are shown below. Is there sufficient evidence at = 0.05to conclude that the students did better the second time? Assume the variables are normally distributed.

Student 2 3 4 5 6 7 9 10 Before 72 80 70 75 78 82 69 69 76 81 After 70 76 65 68 75 78 65 70 73 76