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5. A criterion sample involves people who a. are readily available b. can refer other informants C. possess the required characteristics 6. A snowball sample involves people who a. are readily available b. can refer other informants c. possess the required characteristics 7. An opportunity sample, a snowball sample, or a criterion sample is used a. in ethnography b. for case studies c. by phenomenologists 8. Of the qualitative research designs, the largest sample is usually used in a. ethnographic studies b. case studies c. phenomenological studies 9. Of the qualitative research designs, the smallest sample is usually used in a, ethnographic studies b. case studies c, phenomenological studies 10, Historical researchers use as samples a. documents b, artifacts c. both documents and artifacts