{"id":11151,"date":"2025-07-15T13:34:50","date_gmt":"2025-07-15T13:34:50","guid":{"rendered":"https:\/\/functiontranslator.com\/dist-t\/"},"modified":"2021-02-25T17:31:13","modified_gmt":"2021-02-25T17:31:13","slug":"t-dist","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/pt-pt\/t-dist\/","title":{"rendered":"DIST.T"},"content":{"rendered":"

Introdu\u00e7\u00e3o \u00e0 fun\u00e7\u00e3o de distribui\u00e7\u00e3o T<\/h2>\n

A fun\u00e7\u00e3o T.DIST<\/strong> no Microsoft Excel e DIST.T<\/em> no Google Planilhas \u00e9 utilizada para calcular a distribui\u00e7\u00e3o T de Student. Essa distribui\u00e7\u00e3o de probabilidade \u00e9 comumente aplicada em testes estat\u00edsticos, particularmente em casos envolvendo amostras de tamanho reduzido. A fun\u00e7\u00e3o \u00e9 essencial para determinar probabilidades e analisar diferen\u00e7as entre m\u00e9dias de conjuntos de dados.<\/p>\n

Sintaxe e Exemplos<\/h2>\n

A sintaxe da fun\u00e7\u00e3o em Excel \u00e9: <\/p>\n

 T.DIST(x, graus_de_liberdade, cumulativo) <\/code><\/pre>\n
 Onde: <\/p>\n
    \n
  • x<\/strong> representa o valor t para o qual se deseja avaliar a distribui\u00e7\u00e3o.<\/li>\n
  • graus_de_liberdade<\/strong> indicam os graus de liberdade na distribui\u00e7\u00e3o t.<\/li>\n
  • cumulativo<\/strong> \u00e9 um par\u00e2metro l\u00f3gico que define o formato da fun\u00e7\u00e3o: se TRUE, retorna a distribui\u00e7\u00e3o acumulativa; se FALSE, retorna a fun\u00e7\u00e3o de densidade de probabilidade.<\/li>\n<\/ul>\n
    Exemplo no Excel: <\/p>\n
     =T.DIST(2.0, 10, TRUE) <\/code><\/pre>\n
     Este exemplo calcula a probabilidade cumulativa de obter um valor t igual ou inferior a 2.0, com 10 graus de liberdade.<\/p>\n
    Aplica\u00e7\u00f5es Pr\u00e1ticas<\/h2>\n
    An\u00e1lise de resultados de testes<\/h2>\n
    Imagine que um professor deseje verificar se a m\u00e9dia dos resultados de um teste aplicado a sua turma \u00e9 significativamente diferente de 70. O teste foi feito com 12 alunos, tendo m\u00e9dia de 75 e desvio padr\u00e3o de 10. Vamos calcular o valor-p usando a fun\u00e7\u00e3o T.DIST. Primeiro, determinamos o valor t com a f\u00f3rmula: <\/p>\n
     t = (M\u00e9dia amostral - M\u00e9dia esperada) \/ (Desvio padr\u00e3o \/ SQRT(n)) t = (75 - 70) \/ (10 \/ SQRT(12)) = 1.732 <\/code><\/pre>\n
     Utilizamos ent\u00e3o T.DIST<\/em> para obter o valor-p: <\/p>\n
     =T.DIST(1.732, 11, TRUE) <\/code><\/pre>\n
     Este c\u00e1lculo fornece o valor p correspondente \u00e0 \u00e1rea sob a curva da distribui\u00e7\u00e3o t de Student \u00e0 esquerda de 1.732, com 11 graus de liberdade.<\/p>\n
    Compara\u00e7\u00e3o de duas m\u00e9dias de amostras pequenas<\/h2>\n
    Consideremos um estudo que analisa dois grupos pequenos de pacientes submetidos aos tratamentos A e B, cada um com 8 pacientes. As m\u00e9dias dos resultados s\u00e3o 24 para o grupo A e 19 para o grupo B, com desvios padr\u00f5es de 4 e 5, respectivamente. Para verificar uma diferen\u00e7a significativa entre os grupos, calculamos primeiro o valor t: <\/p>\n
     t = (M\u00e9dia A - M\u00e9dia B) \/ SQRT((Desvio A^2)\/nA + (Desvio B^2)\/nB) t = (24 - 19) \/ SQRT((4^2)\/8 + (5^2)\/8) = 2.179 <\/code><\/pre>\n
     A seguir, usamos a fun\u00e7\u00e3o T.DIST para encontrar o valor-p: <\/p>\n
     =T.DIST(2.179, 8+8-2, TRUE) <\/code><\/pre>\n
     Este c\u00e1lculo indica a probabilidade de encontrar uma diferen\u00e7a t\u00e3o grande ou maior que a observada sob a hip\u00f3tese nula de que n\u00e3o h\u00e1 diferen\u00e7a entre os tratamentos.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Devolve os Pontos Percentuais (probabilidade) para a distribui\u00e7\u00e3o t de Student<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[442],"tags":[],"class_list":["post-11151","post","type-post","status-publish","format-standard","hentry","category-estatistica"],"acf":[],"yoast_head":"\nFun\u00e7\u00e3o T.DIST (DIST.T) no Excel \u2013 como funciona, exemplos e sintaxe<\/title>\n<meta name=\"description\" content=\"Breve descri\u00e7\u00e3o da fun\u00e7\u00e3o T.DIST (DIST.T) do Excel. 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