Sampling Bias

Definition

Sampling bias occurs when the sample used in a study or survey is not representative of the entire population, leading to inaccurate conclusions. It can happen if certain groups are overrepresented or underrepresented in the sample.

Analogy

Imagine you're trying to decide on a movie to watch with your friends, but only one person gets to choose. If that person only likes action movies and doesn't consider anyone else's preferences, it would be a biased selection process that may not accurately represent what everyone wants to watch.

Related terms

Random Sampling: A method of selecting a sample where each member of the population has an equal chance of being chosen. This helps reduce sampling bias.

Nonresponse Bias: Occurs when individuals chosen for a survey do not respond, leading to a skewed representation of opinions.

Convenience Sample: A type of non-random sampling where individuals who are conveniently available or easy to reach are included in the study, potentially introducing bias.