A recent study investigated tractor skidding distances along a road

  

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

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