Term best describes a proof in which you assume the opposite of what you want to prove

Do graduates from uf tend to have a higher income than students at fsu, five years after graduation? a random sample of 100 graduates was taken from both schools. let muf be the population mean salary at uf and let mufsu be the population mean salary at fsu. how should we write the alternative hypothesis?

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

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