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9. If the researcher is faced with a research problem wherein the population needs to be
divided into mutually exclusive groups (such as age groups), and random samples
are drawn from each group, the researcher has just selected a(n):
a. judgment sample.
b. sample random sample.
c. convenience sample.
d. stratified random sample.
divided into mutually exclusive groups (such as age groups), and random samples
are drawn from each group, the researcher has just selected a(n):
a. judgment sample.
b. sample random sample.
c. convenience sample.
d. stratified random sample.
d