what is the null hypothesis and can you give me some simple examples?
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The null hypothesis exists to keep you objective when you design your experiment. Humans have a tendency to try to prove their beliefs correct, so you protect yourself against bias by using a null hypothesis, setting out to prove that nothing will happen rather than trying to prove that *something* will happen. An example is, “There will be no significant difference between boys’ and girls’ scores on an IQ test. Any difference will be due to chance.” That second sentence is important, most assessors will take points off if you don’t include it.
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