Examples of the Null Hypothesis To write a null hypothesis, first start by asking a question. Students are often trying to make their hypotheses sound interesting, or important, and so unintentionally introduce language which suggests they are hunting for causal relationships.

Hence the need to perform a formal statistical hypothesis test to decide objectively if there is a difference.

If I replace the battery in my car, then my car will get better gas mileage. This is one reason why it's important to repeat experiments. After a problem is identified, the scientist would typically conduct some research about the problem and then make a hypothesis about what will happen during his or her experiment.

Contrary to popular belief, people can see through walls. Age has no effect on mathematical ability. An alternative hypothesis is one in which some difference or effect is expected.

Nothing new is happening.

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Writing null and alternative hypotheses (practice)