Researchers want to test the number of people who prefer Coke over Pepsi and so ask every third pedestrian on a busy sidewalk which they prefer. This is an example of
a. purposive sampling
b. simple random sampling
c. cluster sampling
d. systematic sampling
e. quota sampling
Question 2
In nonprobability samples, the error of estimation
a. represents the likelihood that an individual from the population will be sampled
b. tends to be underestimated
c. tends to be overestimated
d. is more influenced by sample size than it is in probability samples
e. cannot be calculated
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