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A researcher asked random samples of 50 kindergarten teachers and 50 12th grade teachers how much of their own money they spent on school supplies in the previous school year. They wanted to see if teachers at one grade level spend more than teachers at the other grade level.
-In this study, it turns out that 12^th grade teachers generally earn more money than kindergarten teachers. The variable 'income of the teacher' is an example of

Question

Quizplus · Accepted Answer

The 'income of the teacher' is a confounding variable because it is an external factor that could influence the main relationship being studied (the amount of money spent on school supplies by teachers of different grade levels) without being the primary focus of the study.

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