The answer to the equation is 4.

In this instance, Stata presents results for all three alternatives. Under the headings Ha: diff and Ha: diff > 0 are the results for the one-tailed tests. In the middle, under the heading Ha: diff

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For instance, if you want to see if Group A scored higher or lower than Group B, then you would want to use a two-tailed test. This is because a two-tailed test uses both the positive and

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The answer to the equation is 4.

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A test of a statistical hypothesis, where the alternative hypothesis is two-tailed. For one-tailed, we use either > or For two-tailed, we use ≠

Some hypotheses predict only that one value will be different from another, without additionally predicting which will be higher. The test of such a hypothesis is nondirectional or two‐tailed because an extreme test statistic in either tail of

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