The number of sit-ups that a person can do in one minute, both before and after a physical fitness course was recorded. The data is shown below for 10 randomly selected participants.

Is there sufficient evidence to conclude that a significant amount of improvement took place? Assume variable is normally distributed. Test using alpha = 0.01.

Before 30 23 25 29 27 25 30 45 34 26

After 31 27 25 35 34 35 32 52 50 43