Question

1 multiple choice 2 points which of the following statements are true? i. random sampling is a good way to reduce response bias. ii. to guard against bias from undercoverage, use a convenience sample. iii. increasing the sample size tends to reduce survey bias. iv. to guard against nonresponse bias, use a mail-in survey. none of the above i only iv only ii only iii only

Explanation:

• Statement I: Random sampling helps ensure each population member has an equal chance of selection, reducing response bias (e.g., selecting only certain groups). This is true.
• Statement II: A convenience sample (e.g., people you easily access) increases undercoverage bias, as it excludes those not in the convenient group. False.
• Statement III: Increasing sample size reduces sampling error (variability), but survey bias (e.g., response, nonresponse) is about how data is collected, not sample size. False.
• Statement IV: Mail - in surveys often have high nonresponse rates (people don't return them), so they increase nonresponse bias, not guard against it. False.

Only Statement I is true.

Answer:

I only