In His Study About an Existing Product in the Market,Duncan

Multiple Choice

In his study about an existing product in the market,Duncan limited his study only to those respondents who had been using the product for at least a year and were willing to be interviewed.In this scenario,Duncan used the _____ strategy to select the sample for his study.

A) purposive sampling
B) simple random sampling
C) systematic sampling
D) stratified sampling
E) cluster sampling