A real-life example of a hidden variable would be age in research that checks the correlation between shirt sizes in grade school and reading ability.
In a research that checks whether student shirt sizes (independent variable) have an impact on reading ability, it is found that students with high shirt sizes are better at reading.
A hidden variable here is age. Students who are older will more likely have a higher shirt size and better reading comprehension.
Find out more on hidden variables at https://brainly.com/question/17116134.
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