T test as a parametric statistic / 대한마취과학회지
Korean Journal of Anesthesiology
;
: 540-546, 2015.
Artigo
em Inglês
| WPRIM
| ID: wpr-153543
ABSTRACT
In statistic tests, the probability distribution of the statistics is important. When samples are drawn from population N (micro, sigma2) with a sample size of n, the distribution of the sample mean X should be a normal distribution N (micro, sigma2/n). Under the null hypothesis micro = micro0, the distribution of statistics z=X-micro0/sigma/radical(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-micro0/s/radical(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.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Distribuição Normal
/
Bioestatística
/
Análise por Pareamento
/
Tamanho da Amostra
Tipo de estudo:
Estudo prognóstico
Idioma:
Inglês
Revista:
Korean Journal of Anesthesiology
Ano de publicação:
2015
Tipo de documento:
Artigo
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