Example: Selection Bias in Case-Control Studies

Another example of selection bias in Case-control Studies

Summary of "COVID-19 infection and death rates: the need to incorporate causal explanations for the data and avoid bias in testing"

Non-response Bias

1936 Literary Digest Straw Poll

What type of systematic error occurs when the method used to select participants results in a sample that fails to accurately represent the broader target population?

A researcher wants to study stress levels among all undergraduate students at a university. She collects her data by distributing surveys exclusively to students who visit the campus counseling center. Because every person surveyed is a real undergraduate student at the university, this method produces a sample that accurately represents the broader undergraduate population.

A research team is designing several psychology studies. Match each intended target population with the sampling method that would most likely introduce sampling bias by systematically excluding important segments of that group.

A researcher intends to study the average stress levels of all employees at a large corporation but decides to recruit participants only from the company’s voluntary 'Stress Management and Yoga' workshop. Arrange the steps below to analyze the logical sequence of how this specific selection method results in a failure to accurately represent the broader population.

A researcher is developing a study to measure the average physical activity levels of all senior citizens (aged $65+$) living in a large city. To create a sampling plan that effectively minimizes sampling bias and ensures the results can be generalized to the entire elderly population, which of the following procedures should the researcher implement?

A researcher claims that a new mindfulness intervention is effective for 'all university students' based on a study that only recruited participants from highly competitive 'Advanced Statistics' courses. When evaluating the validity of the researcher's generalization to the entire student body, a critic would argue that the conclusion is flawed because the selection method introduced _____.

A systematic error that occurs when the method used to select participants results in a sample that fails to accurately represent the broader target population is known as _____ bias.

A developmental psychologist wants to study the sharing behavior of all three-year-old children in a city. She collects her data by observing children who attend an expensive private daycare. If these children differ in important socioeconomic ways from the overall population of three-year-olds in the city, this selection method introduces sampling bias, meaning the findings cannot be safely generalized.

A researcher aims to study the average sleep quality of all university students but only surveys students leaving the campus library at midnight. Analyze this research scenario by matching each component of the study with its role in the context of sampling bias.

Evaluate the threat of sampling bias on a study's generalizability by ordering the steps a researcher must take to determine if their findings can be safely generalized.

Which of the following best describes sampling bias in psychological research?

If a psychologist recruits participants for a study on typical college student stress levels by only asking students who visit the campus counseling center, the resulting sample is likely to suffer from sampling bias.

A researcher investigating the average daily exercise duration of adults in a city recruits participants by handing out surveys exclusively at the finish line of a local marathon. The study concludes that the average adult exercises for over two hours a day, which cannot be safely generalized to the city's broader population. This systematic error, caused by an unrepresentative participant selection method, is called ____.

A psychological researcher wants to study the overall adult population of a large city, but uses flawed participant selection methods. Analyze each recruitment strategy and match it to the specific way it introduces sampling bias.

A peer reviewer is evaluating a newly submitted psychology manuscript and suspects a fundamental flaw in how the study was conducted. Arrange the reviewer's logical steps in critiquing the study's validity due to sampling bias, starting from the initial examination of the methodology to the final judgment on the study's claims.

When a participant selection method results in a sample that differs in important ways from the overall target group, this systematic error is known as what?

If a researcher discovers that their participant selection method has introduced sampling bias, they can eliminate this systematic error simply by increasing their sample size using that exact same recruitment method.

A researcher wants to understand the typical sleep habits of all undergraduate students at a large university. To gather data, the researcher emails a survey exclusively to students enrolled in 8:00 AM classes. The study finds that 90% of respondents report getting less than six hours of sleep. Why does this method of participant selection introduce sampling bias?

A clinical psychologist aims to estimate the prevalence of severe sleep disorders among all adults in a state. To gather participants quickly, the psychologist posts survey flyers exclusively on the bulletin boards of specialized psychiatric sleep clinics. The study concludes that 60% of the state's adults suffer from severe sleep disorders. Which of the following is the most accurate analysis of how sampling bias invalidates this conclusion?

A student researcher submits a proposal to study the relationship between social media use and self-esteem among all adolescents in a country. The researcher plans to recruit 5,000 participants exclusively by posting a survey link on a popular online forum dedicated to severe anxiety support. As a reviewer evaluating the methodological soundness of this proposal, which of the following is the most accurate critique regarding sampling bias?