determining critical value of z for a 2 tailed test with an alpha of .05

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In this video I show how to use the unit normal table in determining critical value of z for a 2 tailed test with an alpha of .05
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Thank you! Very helpful and easy to follow

blackanimefan
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Can we find this ‘z’ value without this table. Is there any formula to find this?

Jessy
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please if you have alpha=0.0.25/n=25/б=3.0 for the upper tailed test the appropriate critical value will be how much !!

ahmedbenahmed