Forestry Chapter 8 Exam Questions and
Answers
Population size = what variable - correct answer-N
plots - correct answer-finite areas with predetermined shapes and sizes in which we
measure all of trees
why do we need to sample? - correct answer-it is too expensive and time consuming to
measure every tree.
What are the two primary ways to chose a sample? - correct answer-1. Simple Random
Sampling (SRS)
2. Systematic Sampling (SYST)
simple random sampling - correct answer-A method by which sampling units (inventory
plots in our case) are randomly selected from a population (N).
When using SRS, the probability of randomly selecting one observation from the
population is based solely on what? - correct answer-Size of the population (total
number of observations in the population)
Cartesian coordinate system - correct answer-Defines the boundaries of the stand and
sets a simple coordinate system based on the dimensions of the area. Then simple x
and y coordinates for plot locations are derived using a random number generator.
Cartesian coordinate system can be problematic in cases where the forest stand in
question is an irregular shape (T/F) - correct answer-T
Cartesian coordinate system: Even though choosing coordinates is fairly simple, finding
the chosen locations in a forested landscape can be difficult, depending on the size and
complexity of the area. - correct answer-T
Advantages of SRS (simple random sampling) - correct answer--Works well for
relatively homogeneous populations
-Works well when data frame is available
-Useful when previous or ancillary data are lacking
Disadvantages of SRS - correct answer--Can be expensive, because it is not efficient
with regard to time spent.
-Does NOT insure complete representation of the target population
Answers
Population size = what variable - correct answer-N
plots - correct answer-finite areas with predetermined shapes and sizes in which we
measure all of trees
why do we need to sample? - correct answer-it is too expensive and time consuming to
measure every tree.
What are the two primary ways to chose a sample? - correct answer-1. Simple Random
Sampling (SRS)
2. Systematic Sampling (SYST)
simple random sampling - correct answer-A method by which sampling units (inventory
plots in our case) are randomly selected from a population (N).
When using SRS, the probability of randomly selecting one observation from the
population is based solely on what? - correct answer-Size of the population (total
number of observations in the population)
Cartesian coordinate system - correct answer-Defines the boundaries of the stand and
sets a simple coordinate system based on the dimensions of the area. Then simple x
and y coordinates for plot locations are derived using a random number generator.
Cartesian coordinate system can be problematic in cases where the forest stand in
question is an irregular shape (T/F) - correct answer-T
Cartesian coordinate system: Even though choosing coordinates is fairly simple, finding
the chosen locations in a forested landscape can be difficult, depending on the size and
complexity of the area. - correct answer-T
Advantages of SRS (simple random sampling) - correct answer--Works well for
relatively homogeneous populations
-Works well when data frame is available
-Useful when previous or ancillary data are lacking
Disadvantages of SRS - correct answer--Can be expensive, because it is not efficient
with regard to time spent.
-Does NOT insure complete representation of the target population
