In order to measure sentiments regarding special holiday programming targeted towards families ofcancer survivors, Stephanie the stats intern contacted several local cancer clinics to speak with family counselorsthere. These counselors then were asked to provide additional contacts for others, such as care providers and other advocates. These names would only have been located by referral, and those included had a common characteristic, namely involvement with the care for familiesof cancersurvivors.

Which statistical sampling technique best describes her methodology?

1. cluster sampling
2. convenience sampling
3. judgment sampling
4. network sampling
5. quota sampling
6. simple random sample
7. snowball sampling
8. stratified sampling
9. systematic sampling