Random Sampling: Advantage - less chance of bias as respondents are chosen at random., Advantage - simple and quick to select sample. , Disadvantage - the sample may not reflect the target market. , Disadvantage - It can be expensive as a large sample is required. , Quota Sampling: Advantage - cheaper as less respondents are required. , Advantage - can select customers that reflect the target market. , Disadvantage - harder to eliminate bias in the selection process. ,

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