NO.PZ2023060502000010
问题如下：
Analysts performing bootstrap:
选项：
A.seek to create statistical inferences of population parameters from a single
sample.
B.repeatedly draw samples of the same size, with replacement, from the original
population.
C.must specify probability distributions for key risk factors that drive the
underlying random variables.
解释：
A is correct. Bootstrapping through random sampling generates the observed
variable from a random sampling with unknown population parameters. The analyst
does not know the true population distribution, but through sampling can
infer the population parameters from the randomly generated sample. B is incorrect
because, when performing bootstrap, the analyst repeatedly draws samples
from the original sample and not population, where each individual resample has
the same size as the original sample and each item drawn is replaced for the next
draw. C is incorrect because, when performing bootstrap, analysts simply use the
observed empirical distribution of the underlying variables. In a Monte Carlo
simulation, in contrast, the analyst would specify probability distributions for key
risk factors that drive the underlying variables.
怎么理解A选项的a singlesample?
