17.11 Quick revision questions
Consider again the model for tree diameters in Example 17.7 (Aedo-Ortiz et al. 1997): a normal distribution with \(\mu=8.8\) inches, and \(\sigma=2.7\) inches.
- A tree diameter of
7.9 inches
corresponds to a \(z\)-score (to two decimal places) of:
- The probability that a tree has a diameter less than
7.9 inches is (as a decimal value):
- The probability that a tree has a diameter greater than
7.9 inches is (as a decimal value):
- A tree diameter of
9 inches
corresponds to a \(z\)-score (to two decimal places) of (as a decimal value):
- The probability that a tree has a diameter less than
9 inches is (as a decimal value):
- The probability that a tree has a diameter greater than
9 inches is (as a decimal value):
References
Aedo-Ortiz DM, Olsen ED, Kellogg LD. Simulating a harvester-forwarder softwood thinning: A software evaluation. Forest Products Journal. 1997;47(5):36–41.