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An incentive is often used to encourage people to participate in a study, such as free...

An incentive is often used to encourage people to participate in a study, such as free tickets to an event, money donated to a charity, a chance to win a prize, or even cash. How can an incentive create a bias within the study? What group might likely not be included in a study and what group might be over represented when an incentive is used.

math   Statistics-And-Probability   
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When incentive is used to lure people for participation in the survey, there will be bias within the study. This is because the affluent section of the society won't be interested in such incentives and also more of middle class youth will be involved. Hence the sample won't be representative of the population leading to bias.

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