hannah svenson was trying to decide whether to use a new racing wax for cross-country skis. she decided that the wax would be worth the price if she could average less than 55 minutes on a course she knew well, so she planned to study the wax by racing on the course 8 times. her race 8 race times were 56.3, 65.9, 50.5, 52.4, 46.5, 57.8, 52.2, and 43.2 minutes. should she buy the wax? is this a one- or two-sided test?