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9 Σεπ 2020 · How to find zα/2 using a calculator. We can also use a Critical Z Value Calculator to find zα/2 for some test. For example, for some test that is using a 90% confidence level we can simply enter 0.1 as the significance level and the calculator will automatically return the value of 1.645 as the corresponding critical z value: Common Values for zα/2
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Finding z α/2 Note: z α/2 is a z-score corresponding to right-tailed area of α/2.
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