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.