A random sample tends not to be an exact replica of its parent population. This fact has
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(a) All possible random samples can include a few samples that are exact replicas of the population, but most samples aren’t exact replicas.
(b) A more representative sample can be obtained by handpicking (rather than randomly selecting) observations.
(c) Insofar as it misrepresents the parent population, a random sample can cause an erroneous generalization.
(d) In practice, the mean of a single random sample is evaluated relative to the variability of means for all possible random samples.
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