Experts say that, when directly tested, the null hypothesis does not predict any effect, and the “alternative” hypothesis contradicts the former by predicting an effect. Additionally, the “research” type of hypothesis can take different forms. A knowledge base entitled Research Methods indicates there are “one-tailed” and “two-tailed” research hypotheses where, respectively, the first type specifies a particular direction (e.g., an increasing direction or a decreasing direction) and the second type specifies a change only rather than a direction.
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