Ethical issues are most likely to be posed by

Ethical issues are most likely to be posed by
 
  a. a sample that does not represent the population.
  b. a study with experimenter bias.
  c. a study with response error.
  d. a covert study.
  e. an establishment study.

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When sociologists conduct sample surveys, they ask questions of a systematic sample of people. What is the relationship of the sample to the population of interest?
 
  a. The sample is the same as the population.
  b. The sample is representative of the population.
  c. The sample answers questions that the population refuses to answer.
  d. The sample has a smaller response error than the population.
  e. The sample represents only the working part of the population.