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one of the main advantages of attending a large university is that you can often save money. smaller colleges are often private and charge higher tuition rates. a large public university can easily have 25,000 students or more taking classes on that campus. that higher number of students keep tuition costs down.

a constant variable, normally called a controlled variable, is the term for a variable that remains constant throughout an experiment, though other variables may change. an example is the water pressure for a faucet when measuring the amount of water released when the faucet is opened to various increments.