A two-tailed test is both, upper and lower tailed!
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Alpha or significance level is usually 0.1 or 0.05 for a 2-tailed test.
The answer depends on whether the test is one-tailed or two-tailed.One-tailed: z = 1.28 Two-tailed: z = 1.64
The answer depends on the distribution under consideration.
advantage
2.58