Norman thinks that the brain function of students suffers when they receive less sleep. He predicts that students who get less s
leep 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.
The pH scale measures the concentration of how acidic or basic something is. The lower the number below 7, is acidic. Above 7 is basic. 7 is waters purest form.
