Minimizing tractor skidding distance. Refer to the Journal of Forest Engineering (July 199...

Minimizing tractor skidding distance. Refer to the Journal of Forest Engineering (July 1999) study of minimizing tractor skidding distances along a new road in a European forest, presented in Exercise. The skidding distances (in meters) were measured at 20 randomly selected road sites. The data are repeated in the accompanying table and saved in the SKIDDING file. In Exercise, you conducted a test of hypothesis for the population mean skidding distance. Now conduct a test to determine whether the population median skidding distance is more than 400 meters. Use α =.10.

Minimizing tractor skidding distance. Refer to the Journal of Forest Engineering (July 1999) study of minimizing tractor skidding distances along a new road in a European forest. The skidding distances (in meters) were measured at 20 randomly selected road sites. The data (saved in the SKIDDING file) are repeated in the accompanying table. Recall that 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 = .10.

Based on Tujek, J. and Pacola, E. “Algorithms for skidding distance modeling on a raster Digital Terrain Model.” Journal of Forest Engineering , Vol. 10, No. 1, July 1999 ( Table).

Data on 22 Adult Aphasias