The type of sampling error that is the most objected is:

The type of sampling error that is the most objected is:
 
  a. Interviewer bias
  b. Respondent bias
  c. When an interviewer or researcher makes up data due to being under pressure
  d. Underrepresentation

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Suppose the proportion of males attending your college is .487 . What percent of
  students are female?
 
  a. .487
  b. .513
  c. 48.7
  d. 51.3

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What types of sampling methods are considered less reliable and more fraught with
  sampling errors?
 
  a. Random Sampling
  b. Non-probability Sampling
  c. Probability Sampling
  d. Simple Random Sampling