n epidemiologist is curious as to whether lead contamination in drinking water l

Question

n epidemiologist is curious as to whether lead contamination in drinking water leads to learning disabilities in children. She onducts a quasi-experiment and picks two towns, one that was exposed to lead contamination in their drinking water and nother that was not exposed to drinking water lead contamination. She then measures the incidence of learning disabilities ver time in the two towns. Which of the following internal validity threats is most concerning? O a) Selection effects O b) Testing effects O c) Placebo effects O d) Attrition

Explanation / Answer

The answer is Option A. Selection effects is the bias that results in threats to internal validity due to the selection of a particular set of individuals or groups for a study.

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