Use the paired t-interval procedure to obtain the required confidence interval. You may assume that the conditions for using the procedure are satisfied.A coach uses a new technique in training middle distance runners. The times, in seconds, for 9 different athletes to run 800 meters before and after this training are shown below.

Athlete	A	B	C	D	E	F	G	H	I
Before	115.2	120.9	108.0	112.4	107.5	119.1	121.3	110.8	122.3
After	116.0	119.1	105.1	111.9	109.1	115.2	118.5	110.7	120.9

Determine a 99% confidence interval for the difference between the mean time before and after training.