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What is the z score for the 90% confidence level?

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The Z score for 90% confidence level is 1.645. The level of confidence is 1-alpha; alpha is a notation in statistics which means the score which has the specified area in the right tail. The z score for 90% level of confidence is a Z-score which has 0.05 to the right.



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1.6449 according to Gilbert's Statistical Methods for Environmental Pollution Monitoring

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