What is the difference between random sampling and stratified sampling?
a. Stratified sampling combines random selection with predetermined weighting of a population's demographic characteristics.
b. Stratified sampling gives each member of a targeted population the same probability of being polled, whereas simple random sampling does not.
c. Random sampling incorporates random selection into the polling procedure, whereas stratified sampling allows for self-selection.
d. Stratified sampling relies on techniques to minimize bias, whereas simple random sampling does not.
Answer: a
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