Which of the following is FALSE with regard to stratified sampling?
a. A stratified random sample is drawn by dividing the parent population into mutually exclusive and exhaustive subsets and by then taking a random sample of these subsets.
b. The basic rule by which we stratify suggests the resulting strata should be as homogeneous as possible.
c. When sampling from a population that is highly skewed, a stratified sample generally provides the most representative sample.
d. A market researcher needs information about parts of the population, as well as the total population. He should therefore plan on using a stratified random sample.
e. Stratified samples are more statistically efficient than simple random samples.
Question 2
The feature that distinguishes stratified sampling from other forms of probability sampling is that only stratifid samples
a. involve partitioning the parent population into mutually exclusive and exhaustive subsets.
b. allow the a priori determination of the probability that any population element will be included in the sample.
c. make the probability of selection of any population element equal.
d. involve partitioning the parent population into mutually exclusive and exhaustive subsets and selecting a simple random sample from each subset.
e. None of the above.
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