The skidding distances (in meters) were measured at 20 randomly chosen road sites. The data (saved in the SKIDDING file) are repeated below. Recall that logger working on road claims the mean skidding distance is at least 425 meters. Is there sufficient evidence to refute this claim? Use ? = .10.
488 350 457 199 285 409 435 574 439 546
385 295 184 261 273 400 311 312 141 425