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# Critical Value, statistics.?

Find the critical value z a/2 that corresponds to the given confidence level...80%

Z a/2 =?

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- Keun WoongLv 71 decade agoFavorite Answer
If the confidence level is 80%, then the significance level is 0.20 and this is splitted into two regions since CI is always two tailed. Using table, find the corresponding z score for 0.1 or 0.9. Make the value positive and you'll get z a/2 = 1.28

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