A hypothesis is an educated guess or proposition made as a basis for reasoning or research without any assumption of its truth. It's testable and falsifiable statement about two or more variables related in some way.
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This is what you measure in an experiment and what changes when you change the independent variable - like how much you enjoy the movie after watching it.
This is a group in an experiment that does not receive the treatment or test variable. It's like your friend who didn't watch any movie but still rates their evening.