AP Statistics Bias and Sampling

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What is nonresponse bias?

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Nonresponse bias occurs when individuals selected for a sample do not respond, leading to a potential distortion of the results if the nonrespondents differ significantly from respondents.

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How can researchers minimize nonresponse bias?

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Researchers can minimize nonresponse bias by using techniques such as follow-up surveys, offering incentives, and adjusting the data to account for nonresponse.

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What is selection bias?

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Selection bias is a type of bias that occurs when the sample selected for a study is not representative of the population intended to be analyzed.

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How does selection bias impact statistical studies?

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Selection bias can introduce systematic errors and make the findings less generalizable, leading to inaccurate conclusions.

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What is cluster sampling?

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Cluster sampling involves dividing the population into groups, or clusters, and then randomly selecting some of those clusters for analysis.

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Provide an example of cluster sampling.

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An example of cluster sampling is conducting a survey in a large city by dividing the city into neighborhoods and then randomly selecting a few neighborhoods to survey.

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What is simple random sampling?

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Simple random sampling is a method where individuals are selected randomly from the entire population, ensuring each individual has an equal chance of being chosen.

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How does stratified random sampling differ from simple random sampling?

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Stratified random sampling divides the population into subgroups and then takes a random sample from each subgroup, while simple random sampling selects individuals from the entire population.

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What is an example of selection bias in research?

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In a study on the impact of exercise on weight loss, only participants who are already fit are selected, leading to biased results.

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What is the purpose of follow-up surveys in minimizing nonresponse bias?

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Follow-up surveys aim to reach nonrespondents to gather their responses, thereby reducing the potential bias introduced by their absence.