Track coaches, runners, and fans talk a lot about the speed of the track. The surface of

Question:

Track coaches, runners, and fans talk a lot about the €œspeed of the track.€ The surface of the track is believed to have a direct effect on the amount of time that it takes a runner to cover the required distance. To test this effect, 10 runners were asked to run a 220- yard sprint on each of two tracks. Track A is a cinder track, and track B is made of a new synthetic material. The running times (in seconds) are given in the following table. Test the claim that the surface on track B is conducive to faster running times.