REN R 215 EXAM QUESTIONS WITH
CORRECT ANSWERS
net scale is often defined as log volume less defect - ✔✔true
13+/7 is a common merchantability standard in Alberta - ✔✔true
a co-dominant tree is usually defined as one that is
a) overtopped and suffering
b) overtopped by some others
c) overtapping all others - ✔✔overtopped by some others
a characteristic of a good estimate is that it is both precise and accurate - ✔✔true
a diameter tape measures diameter of a tree using a special scale where each cm of the
circumference is represented by pi cm of of diameter on the tape - ✔✔true
a good rule of thumb is that tree taper is 1% of the length - ✔✔true
a typical tree height for white spruce growing in alberta is over 35m - ✔✔false
as degrees of freedom increases what happens to t-value from the studen'ts t table -
✔✔decreases, approaches the normal value
assume that we conduct 2 separate check-scaling evaluations for a trainee, one using the
independent and the other using a paired t test. if random samples of the same size are used in
,each test, which of the two tests is more likely to detect trainee errors and why - ✔✔paired t
test because each observation evaluates the measurement error
Q10- look @ this later
suppose we have collected some sample measurements for a ROM estimator. we find that the
average weight for sample loads is less than the population mean of the weights. how does the
ratio of means estimate for mean volume compare to the average volume per load based only
on samples - ✔✔
suppose we want to test a hypothesis about the population mean. to accept the hypothesis, the
hypothesized mean must be
a) close to but outside the interval
b) close to the middle of the interval\
c) anywhere inside the interval - ✔✔anywhere within the confidence interval
basal area is always defined as the cross-sectional area of wood at breast height - ✔✔false
(im assuming that it's) because it can be anywhere
basal area is piR^2 - ✔✔true
biomass of dry wood is typically 1000kg/mg - ✔✔typically 500kg/mg*** i think. 1000kg/mg
is wet wood or water
correlation is always between 1 and 0 - ✔✔false, it's between -1 and 1
covariance is a measure of joint variability of x and y - ✔✔true
crow ratio is a common measure of vigor - ✔✔true
, dominant trees are assumed to be the most vigorous trees - ✔✔true
estimates of tree height are subject to several sources of error including slope, distance to tree,
errors in distance to tree, lean, instrument scale, and visibility - ✔✔true
estimating tree height using a clinometer and cloth tape is the most accurate procedure, often
achieving errors around 1-2% of height - ✔✔false
girard form class is the ratio of actual tree volume to volume by a cone formula - ✔✔false
how does sample size influence the likelihood of making a type 2 error - ✔✔decreases as
sample size increases
if the skewness parameter for a population is positive, what is implied about the frequency of
trees in the population - ✔✔there are few trees that are much larger than most of the trees
if we are sampling without replacement we must know the total number of elements in the
popoulation - ✔✔true
if we compute a 95% confidence interval for the population log diameter what does the
confidence interval mean - ✔✔the average diameter will fall inside the confidence interval
95% of the time
if we find that the variation of load volumes around the porportional relation between load
weight volume increases SEVERELY as load weight increases, which of the weight scaling
estimation procedures should be used - ✔✔mean of ratios
if you have 400 observations, the probability of getting equal to or greater than the number of
observations is - ✔✔25%
CORRECT ANSWERS
net scale is often defined as log volume less defect - ✔✔true
13+/7 is a common merchantability standard in Alberta - ✔✔true
a co-dominant tree is usually defined as one that is
a) overtopped and suffering
b) overtopped by some others
c) overtapping all others - ✔✔overtopped by some others
a characteristic of a good estimate is that it is both precise and accurate - ✔✔true
a diameter tape measures diameter of a tree using a special scale where each cm of the
circumference is represented by pi cm of of diameter on the tape - ✔✔true
a good rule of thumb is that tree taper is 1% of the length - ✔✔true
a typical tree height for white spruce growing in alberta is over 35m - ✔✔false
as degrees of freedom increases what happens to t-value from the studen'ts t table -
✔✔decreases, approaches the normal value
assume that we conduct 2 separate check-scaling evaluations for a trainee, one using the
independent and the other using a paired t test. if random samples of the same size are used in
,each test, which of the two tests is more likely to detect trainee errors and why - ✔✔paired t
test because each observation evaluates the measurement error
Q10- look @ this later
suppose we have collected some sample measurements for a ROM estimator. we find that the
average weight for sample loads is less than the population mean of the weights. how does the
ratio of means estimate for mean volume compare to the average volume per load based only
on samples - ✔✔
suppose we want to test a hypothesis about the population mean. to accept the hypothesis, the
hypothesized mean must be
a) close to but outside the interval
b) close to the middle of the interval\
c) anywhere inside the interval - ✔✔anywhere within the confidence interval
basal area is always defined as the cross-sectional area of wood at breast height - ✔✔false
(im assuming that it's) because it can be anywhere
basal area is piR^2 - ✔✔true
biomass of dry wood is typically 1000kg/mg - ✔✔typically 500kg/mg*** i think. 1000kg/mg
is wet wood or water
correlation is always between 1 and 0 - ✔✔false, it's between -1 and 1
covariance is a measure of joint variability of x and y - ✔✔true
crow ratio is a common measure of vigor - ✔✔true
, dominant trees are assumed to be the most vigorous trees - ✔✔true
estimates of tree height are subject to several sources of error including slope, distance to tree,
errors in distance to tree, lean, instrument scale, and visibility - ✔✔true
estimating tree height using a clinometer and cloth tape is the most accurate procedure, often
achieving errors around 1-2% of height - ✔✔false
girard form class is the ratio of actual tree volume to volume by a cone formula - ✔✔false
how does sample size influence the likelihood of making a type 2 error - ✔✔decreases as
sample size increases
if the skewness parameter for a population is positive, what is implied about the frequency of
trees in the population - ✔✔there are few trees that are much larger than most of the trees
if we are sampling without replacement we must know the total number of elements in the
popoulation - ✔✔true
if we compute a 95% confidence interval for the population log diameter what does the
confidence interval mean - ✔✔the average diameter will fall inside the confidence interval
95% of the time
if we find that the variation of load volumes around the porportional relation between load
weight volume increases SEVERELY as load weight increases, which of the weight scaling
estimation procedures should be used - ✔✔mean of ratios
if you have 400 observations, the probability of getting equal to or greater than the number of
observations is - ✔✔25%
