economicz

yazena Wrote:
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> When to use 2 tailed vs. 1 tailed test. And if you
> were only offered 1 tailed table, can you use it
> to find 2 tailed tests?


Sure - Take the alpha from the 1-tail test and double it. The one tail test gives you {Z > 1.96} for example and the two tail test would be {Z > 1.96} u {Z < -1.96} for rejection region. Double P-values as well.