Definition of Sampling Bias

Sampling bias occurs when:

Correct Answer Explanation

Sampling Bias occurs when the sampling plan is such that some members of the target population could not possibly be included in the sample.

Types of Non-Sampling Errors:

• Sampling Bias: Systematic exclusion of some members from the sample.
• Non-Response Errors: Occur when the interviewer cannot contact a person or the person refuses to respond — sample may not be representative.
• Errors in Data Acquisition: Arise from recording of incorrect responses, e.g., writing 13 instead of 31 (transposition error).

Example of Sampling Bias:

Conducting a telephone survey when many target respondents do not own phones — they are systematically excluded.