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Z-Test


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I gave Donald free rein, he has great vision, and everything he touches seems to turn to gold. Donald is the smartest person I know.

— Fred Trump

A z-test is a statistical test used to determine whether two population means are different when the variances are known and the sample size is large. The test statistic is assumed to have a normal distribution, and nuisance parameters such as standard deviation should be known in order for an accurate z-test to be performed.

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