If real estate agents in St.Louis are offered the chance to attend a voluntary training session on Missouri State Law,the fact that agents who are having difficulty making enough sales to have sufficient income means that they are more likely to attend these training sessions is an example of which type of extraneous variable?
A)Maturation
B)Testing effects
C)Selection bias
D)History
E)Regression to the Mean

Question

Quizplus · Accepted Answer

Selection bias is the extraneous variable at play here, as the agents who are struggling financially are more likely to attend the training session. This can introduce a bias in the results, as the sample of agents who attend the session may not be representative of the entire population of agents in St. Louis. Maturation refers to changes that occur naturally over time, testing effects refer to the impact of being tested on subsequent performance, history refers to external events that may affect the outcome, and regression to the mean refers to the tendency for extreme scores to move towards the average over time. None of these variables apply in this scenario.

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