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In general, it is not. A one-tailed test is more powerful but it does require the alternative hypothesis to be one sided and, in therefore requires some expectation about the observations if the null hypothesis is not true.

The question, therefore, is appropriate only when the experimenter has extremely limited information about the experiment - not a very common occurrence.

In general, it is not. A one-tailed test is more powerful but it does require the alternative hypothesis to be one sided and, in therefore requires some expectation about the observations if the null hypothesis is not true.

The question, therefore, is appropriate only when the experimenter has extremely limited information about the experiment - not a very common occurrence.

In general, it is not. A one-tailed test is more powerful but it does require the alternative hypothesis to be one sided and, in therefore requires some expectation about the observations if the null hypothesis is not true.

The question, therefore, is appropriate only when the experimenter has extremely limited information about the experiment - not a very common occurrence.

In general, it is not. A one-tailed test is more powerful but it does require the alternative hypothesis to be one sided and, in therefore requires some expectation about the observations if the null hypothesis is not true.

The question, therefore, is appropriate only when the experimenter has extremely limited information about the experiment - not a very common occurrence.

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10y ago

In general, it is not. A one-tailed test is more powerful but it does require the alternative hypothesis to be one sided and, in therefore requires some expectation about the observations if the null hypothesis is not true.

The question, therefore, is appropriate only when the experimenter has extremely limited information about the experiment - not a very common occurrence.

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Q: Why is a two-tailed test preferred over a one-tailed test?
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