Bias in Survey Sampling . Bias Due to Unrepresentative Samples . A good sample is representative . This means that each sample point represents the attributes of a known number of population elements.
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Which of the following statements are true?
I. Random sampling is a good way to reduce response bias. II. To guard against bias from under coverage, use a convenience sample. III. Increasing the sample size tends to reduce survey bias. IV. To guard against non-response bias, use a mail-in survey.
(A) I only (B) II only (C) III only (D) IV only (E) None of the above.