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.
488 | 350 | 457 | 199 | 285 | 409 | 435 | 574 | 439 | 546 |
385 | 295 | 184 | 261 | 273 | 400 | 311 | 312 | 141 | 425 |
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.
Conclusions and Consequences for a Test of Hypothesis
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Conclusion | H0 True | Ha True |
Accept H0 (Assume H0 True) Reject H0 (Assume Ha True) | Correct decision Type I error (probability α) | Type II error (probability β) Correct decision |
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