7. Which one of the following statement about sampling is true?
A. A larger sample is always more representative of the underlying population than a smaller sample.
B. For very large populations, the absolute size of the sample has more impact on the precision of its results than does its size relative to its population.
C. For a given sample size, a simple random sample always produces the most representative sample.
D. The limitations of an incomplete sample frame can almost always be overcome by careful sampling techniques.
ANSWER (B) is correct.
REQUIRED: The true statement about sampling.
DISCUSSION: When the size of the population is very large, the absolute size of the sample may vary considerably even though its size relative to the population does not.
Answer (A) is incorrect. A large sample selected in a biased way is often less representative than a smaller but more carefully selected sample.
Answer (C) is incorrect. Simple random sampling does not eliminate sampling risk. Proper execution of a sample random sample increases the probability of drawing a representative sample.
Answer (D) is incorrect. Items excluded from the sampling frame cannot be included by an appropriate sampling technique.