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单词 z-test
释义
z-test

Statistics
  • A hypothesis test, using a sample of n independent observations, of the null hypothesis that a normal distribution with variance σ2, has mean μ. Writing the sample mean as , the test statistic is z, given by z-testIn the case where the alternative hypothesis is that the mean is not μ, then, if |z| > 1.96, there is evidence to reject the null hypothesis at the 5% significance level in favour of the alternative hypothesis.


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