What type of bias is formed by an interviewer's discretion in deciding whom to approach?

Selection bias occurs when the participants included in a study or survey are not representative of the overall population due to the method used for selecting them. In the context of an interviewer's discretion in deciding whom to approach, this bias can manifest if the interviewer unconsciously favors certain individuals or groups over others, potentially based on characteristics such as appearance, behavior, or accessibility.

When interviewers exercise discretion in choosing whom to approach, they may inadvertently overlook or exclude significant segments of the population. This can lead to a skewed data set that does not accurately reflect the views or experiences of the broader group, ultimately affecting the integrity and reliability of the findings.

In contrast, nonresponse bias relates to differences in the results between those who do respond to a survey and those who do not. Response bias involves inaccuracies in the responses provided by participants, potentially due to misunderstanding questions or social desirability. Sampling error refers to the natural variability that can occur by chance when selecting a sample from a population. Each of these concepts highlights different aspects of research methodology that can influence data collection and analysis.