CF Data Analysis & Reporting 3

Question 1

Which growth model type assumes that a tree's growth rate decreases as it approaches a maximum size, forming an S-shaped curve?

Accepted Answer

Sigmoidal (logistic) model

Answer

Sigmoidal models like the Chapman-Richards or logistic curve describe slow early growth, rapid middle growth, and slowing near maximum size.

Question 2

A forester wants to estimate timber volume for an entire watershed from a sample of plots. After calculating the mean volume per hectare, she multiplies by total watershed area. This is an example of:

Accepted Answer

Expansion by area

Answer

Expansion by area multiplies the per-unit-area estimate by the total area to obtain a population total.

Question 3

In a Geographic Information System (GIS) analysis, which data type is best suited for representing continuous forest canopy cover across a landscape?

Accepted Answer

Raster data

Answer

Raster data represents continuous spatial variables like canopy cover as a grid of cells, each with a value.

Question 4

A site index curve for a forest stand is used primarily to:

Accepted Answer

Evaluate site productivity based on height-age relationships

Answer

Site index uses dominant tree height at a base age (commonly 25 or 50 years) to index the productive potential of a site.

Question 5

When reporting forest inventory results, the 95% confidence interval means that:

Accepted Answer

There is a 95% probability the true population mean falls within this interval

Answer

A 95% confidence interval implies that if sampling were repeated many times, 95% of such intervals would contain the true population parameter.

(CF) Certified Forester Exam Practice Test

(CF) Certified Forester Exam Practice Test

CF Data Analysis & Reporting 3