Extraneous variables
a. tend to be problems in single blind studies, but not double blind studies.
b. tend to reduce the degree of external validity in a study.
c. can be avoided through random sampling.
d. can sometimes be dealt with by using control groups.
Question 2
Survey researchers choose to use samples from a population rather than conducting a census because
a. with large populations, you don't need to survey everybody in order to get a good depiction of what the population is like.
b. it is impossible to get every member of any population.
c. surveying a population typically leads to greater levels of response bias.
d. respondents in a population are more likely to engage in optimizing than respondents in a sample.
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