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10.4097/kjae.2015.68.6.540

http://scihub22266oqcxt.onion/10.4097/kjae.2015.68.6.540
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C4667138!4667138!26634076
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suck abstract from ncbi

pmid26634076      Korean+J+Anesthesiol 2015 ; 68 (6): 540-6
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  • T test as a parametric statistic #MMPMID26634076
  • Kim TK
  • Korean J Anesthesiol 2015[Dec]; 68 (6): 540-6 PMID26634076show ga
  • In statistic tests, the probability distribution of the statistics is important. When samples are drawn from population N (µ, ?2) with a sample size of n, the distribution of the sample mean X? should be a normal distribution N (µ, ?2/n). Under the null hypothesis µ = µ0, the distribution of statistics z=X¯-µ0?/n should be standardized as a normal distribution. When the variance of the population is not known, replacement with the sample variance s2 is possible. In this case, the statistics X¯-µ0s/n follows a t distribution (n-1 degrees of freedom). An independent-group t test can be carried out for a comparison of means between two independent groups, with a paired t test for paired data. As the t test is a parametric test, samples should meet certain preconditions, such as normality, equal variances and independence.
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