Ekin Running shoe designers wanted to test the wear in two different designs of running shoes. They chose a random sample of 6 amateur runners, and had them wear both designs of shoe until the shoe was no longer usable. Which shoe was worn first was randomly assigned. The length of wear for each design was recorded for each runner in weeks. Is there evidence of a difference, on average, in the wear time of the two designs? Use a significance level of 0.05.