1) A researcher attends an art reception in a main metropolitan city. She decides to approach people over the age of 50 and ask them to fill out a short survey regarding purchasing artwork. Is this a probability or a non-probability sampling method? What kind of sampling procedure is this-simple random, stratified random, cluster, haphazard, purposive or quota?
2) Illustrate the relationship between the sample size and survey results? What are some methods to assess potential sampling bias?