Question

An education researcher wonders if young students better learn arithmetic facts using physical flashcards or a new online game. The researcher recruits 505050 students for a study. The study allows parents to choose which learning tool they'd like their child to use: flashcards or the online game. Each student takes a pre-test and a post-test, and at the end of the study, students who used flashcards show significantly better outcomes than students who used the online game.
The researcher concludes that flashcards were more effective than the online game for this group of students.
What is a confounding variable that makes their conclusion inappropriate?

Answer 1

The confounding variable that makes the conclusion inappropriate are the parents who choose the learning tools that they want their children to use.

What is a confounding variable?

A confounding variable is a variable that makes it difficult to establish the true relationship that exists between two variables.

Read more on confounding variables here:

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