Dave pulled out 4 dif CD's to find out which type of music helped him finish his hw the fastest. He used a stopwatch for 5 minutes for each type. What are some constant (controlled) variables in this experiment?

Dave pulled out 4 dif CD's to find out which type of music helped him finish his hw the fastest. He used a stopwatch for 5 minutes for each type.

What are some constant (controlled) variables in this experiment?

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Dave pulled out 4 dif CD's to find out which type of music helped him finish his hw the fastest. He used a stopwatch for 5 minutes for each type. What are some constant (co…

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