Question: If we design two scribbling machines * , one with a 4 - battery case and long markers, and the other with a 2 -

If we design two scribbling machines*, one with a 4-battery case and long markers, and the other with a 2-battery case and short markers, then the scribbling machine with the 2-battery case will move faster than the other machine because the short markers will make the machine less wobbly.
"We tinkered with these machines in class.
We can say that:
The investigation includes a fair test.
The hypothesis includes more than one dependent variable.
The hypothesis is testable
The hypothesis includes more than one independent variable
If we design two scribbling machines*, one with a 4-battery case

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