Question

Which of the following can lead to sample bias? Select the three correct answers.(2 points)
Responses

randomly selecting participants
randomly selecting participants

allowing self-selection in surveys
allowing self-selection in surveys

using a small sample size
using a small sample size

conducting the survey at different times of the day
conducting the survey at different times of the day

surveying only a specific group
surveying only a specific group

using a standardized questionnaire
using a standardized questionnaire
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Answer 1

Correct answers:
- allowing self-selection in surveys
- using a small sample size
- surveying only a specific group

Brief reasons:
- Self-selection lets only certain types of people respond, producing self‑selection bias.
- Small samples are more likely to be unrepresentative and produce sampling bias.
- Surveying only a specific group excludes others and yields selection bias.