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Since obtaining statistical significance is easier to obtain with a directional hypothesis (one-tailed test) than with...

Since obtaining statistical significance is easier to obtain with a directional hypothesis (one-tailed test) than with a non-directional hypothesis (two-tailed test), why would anyone ever design a study with a nondirectional hypothesis?

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a hypothesis is a testable statement which enables one to test their predictions regarding the outcome of the study. there are two types of hypothesis. one tailed hypothesis is the one in which the nature of the effect of the independent variable to dependent variable can be predicted. two tailed hypothesis is the one in which it can be predicted that independent variable will effect the dependent variable but the direction isnt predicted. it is used when we know two groups are different but we dont know which one is better. it is used in a new and exploratory research as we are not dure of the direction of the relationship of the variables. hence people will design a non directional hypothesis in the above two cases

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