A recent study investigated tractor skidding distances along a road in a forest. The ...

A recent study investigated tractor skidding distances along a road in a forest. The skidding distances​ (in meters) were measured at 20 randomly selected road sites. The data are given in the accompanying table. A logger working on the road claims that the mean skidding distance is at least 425 meters. Is there sufficient evidence to refute this​ claim? Use α=0.05.

500

359

465

201

292

414

438

586

430

532

380

300

183

257

281

397

302

316

140

438