Norman thinks that the brain function of students suffers when they receive less sleep. He predicts that students who get less sleep before an exam will receive lower test grades. To investigate his idea, he tests two groups of chemistry students. Group 1 receives four hours of sleep, while Group 2 receives the recommended eight hours of sleep the night before the exam. Both groups consume the same foods before testing and take the same exam in the same room. The room has a constant temperature and level of light for all students. What is the independent variable in Norman's investigation?

The independent variable is the amount of sleep the students get. The independent variable is what you change in an experiment. Since one group received 4 hours of sleep and the other group received 8 hours, that is the independent variable.

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VTshruti VTshruti · Answer 2 · 2022-08-06T06:51:52+02:00

The range of grades students receive on their exam will be the independent variable in Norman's investigation.

What is an independent variable?

The term "independent variable" means exactly what it seems like. It is a variable that is independent of any other variables you are attempting to measure. For illustration, age could be an independent variable.

A dependent variable is one that keeps changing as a result of the manipulation of the independent variable.

It's the outcome you're after, and it "depends" on your independent variable. Dependent variables are also known as Response variables in statistics.

In Norman's study, the independent variable will be the range of grades students receive on their exams.

Thus, this is the independent variable in the investigation done by Norman.

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