Question

ch 8 although web surveys are becoming more frequent, many of them still suffer from which type of bias?
non-response bias
under-coverage bias
volunteer response bias

Explanation:

• Non - response bias: Web surveys often have people who don't respond. Those who don't respond may have different characteristics from those who do, leading to this bias.
• Under - coverage bias: Not all potential respondents (e.g., people without internet access) are included in web surveys, so the sample doesn't fully represent the population, causing under - coverage bias.
• Volunteer response bias: Web surveys rely on volunteers to respond. Volunteers are often self - selected and may have different opinions or characteristics than the general population, resulting in this bias.

Answer:

A. non - response bias
B. under - coverage bias
C. volunteer response bias