In a(n) ___ sample, additional respondents are selected on the basis of referrals from the initial respondents.

In a(n) ___ sample, additional respondents are selected on the basis of referrals from the initial respondents.

In a(n) ___ sample, additional respondents are selected on the basis of referrals from the initial respondents.


a. quota
b. judgment
c. piggyback
d. probability
e. snowball


ANSWER: d


Learn More :