Question 1: When a group is selected from a population on the basis of sharing the same percentages of trait characteristics as are known to exist in the population, then the group so selected would constitute:
a) a random sample
b) a stratified sample
c) a biased sample
d) a sampling distribution
Question 2: Sampling error is assumed to result:
a) when any sample is selected
b) only when a non-representative sample is selected
c) only when a biased sample is selected
d) only when the researcher makes a mistake