{"id":5483,"date":"2025-07-15T13:34:44","date_gmt":"2025-07-15T13:34:44","guid":{"rendered":"https:\/\/functiontranslator.com\/confidence-t\/"},"modified":"2021-02-26T09:51:58","modified_gmt":"2021-02-26T09:51:58","slug":"confidence-t","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/cs\/confidence-t\/","title":{"rendered":"CONFIDENCE.T"},"content":{"rendered":"

V oblasti datov\u00e9 anal\u00fdzy je \u010dasto kl\u00ed\u010dov\u00e9 odhadnout m\u00edru nejistoty asociovanou s v\u00fdb\u011brov\u00fdmi daty. V Excelu a Google Sheets m\u016f\u017eeme vyu\u017e\u00edt funkci CONFIDENCE.T, kter\u00e1 n\u00e1m poskytne horn\u00ed mez konfiden\u010dn\u00edho intervalu pro o\u010dek\u00e1van\u00fd pr\u016fm\u011brn\u00fd rozd\u00edl populace na z\u00e1klad\u011b Studentova t-rozd\u011blen\u00ed.<\/p>\n

Popis a syntaxe<\/h2>\n

Funkce CONFIDENCE.T je kl\u00ed\u010dov\u00e1 pro v\u00fdpo\u010det konfiden\u010dn\u00edho intervalu pr\u016fm\u011brn\u00e9 hodnoty populace, kter\u00e1 je odvozena z v\u00fdb\u011brov\u00e9ho t-rozd\u011blen\u00ed. Je obzvl\u00e1\u0161t\u011b u\u017eite\u010dn\u00e1, pokud je velikost vzorku mal\u00e1 nebo pokud standardn\u00ed odchylka populace nen\u00ed zn\u00e1ma.<\/p>\n

Syntaxe funkce v Microsoft Excel a Google Sheets je:<\/strong><\/p>\n

CONFIDENCE.T(alpha, standard_dev, size)<\/code><\/pre>\n
Parametry:<\/strong><\/p>\n
    \n
  • alpha<\/strong> – \u00darove\u0148 v\u00fdznamnosti; 1 – alpha tedy ur\u010duje konfiden\u010dn\u00ed interval. Nap\u0159\u00edklad, alpha = 0.05 odpov\u00edd\u00e1 95% konfiden\u010dn\u00edmu intervalu.<\/li>\n
  • standard_dev<\/strong> – Standardn\u00ed odchylka vzorku.<\/li>\n
  • size<\/strong> – Po\u010det pozorov\u00e1n\u00ed ve vzorku.<\/li>\n<\/ul>\n
    P\u0159\u00edklad pou\u017eit\u00ed funkce:<\/strong><\/p>\n
    =CONFIDENCE.T(0.05, 10, 30)<\/code><\/pre>\n
    Tento p\u0159\u00edklad vypo\u010d\u00edt\u00e1 horn\u00ed mez konfiden\u010dn\u00edho intervalu pro pr\u016fm\u011br populace s 95% konfiden\u010dn\u00edm intervalem, p\u0159i standardn\u00ed odchylce 10 a velikosti vzorku 30.<\/p>\n
    Aplikace v praxi<\/h2>\n
    \u00daloha 1: Stanoven\u00ed konfiden\u010dn\u00edho intervalu pro pr\u016fm\u011brnou \u017eivotnost \u017e\u00e1rovek<\/strong><\/p>\n
    P\u0159edpokl\u00e1dejme, \u017ee jste provedli test 25 \u017e\u00e1rovek, kter\u00e9 v pr\u016fm\u011bru vydr\u017eely 1200 hodin a m\u011bly standardn\u00ed odchylku 100 hodin. Chceme ur\u010dit 95% konfiden\u010dn\u00ed interval pro pr\u016fm\u011brnou \u017eivotnost jejich \u017e\u00e1rovek.<\/p>\n
    =CONFIDENCE.T(0.05, 100, 25)<\/code><\/pre>\n
    Tento v\u00fdpo\u010det vr\u00e1t\u00ed hodnotu p\u0159ibli\u017en\u011b 41, co\u017e reprezentuje horn\u00ed mez konfiden\u010dn\u00edho intervalu. Tedy, s 95% pravd\u011bpodobnost\u00ed o\u010dek\u00e1v\u00e1me, \u017ee pr\u016fm\u011brn\u00e1 \u017eivotnost \u017e\u00e1rovek se bude pohybovat mezi 1159 a 1241 hodinami.<\/p>\n
    \u00daloha 2: Hodnocen\u00ed pr\u016fm\u011brn\u00fdch v\u00fdsledk\u016f test\u016f student\u016f<\/strong><\/p>\n
    P\u0159edstavte si, \u017ee u\u010ditel vyhodnotil testy 40 student\u016f, kde pr\u016fm\u011brn\u00fd v\u00fdsledek byl 78 bod\u016f se standardn\u00ed odchylkou 10 bod\u016f. Jak\u00fd bude 90% konfiden\u010dn\u00ed interval pro pr\u016fm\u011brn\u00e9 sk\u00f3re?<\/p>\n
    =CONFIDENCE.T(0.1, 10, 40)<\/code><\/pre>\n
    Vypo\u010dten\u00e1 hodnota p\u0159ibli\u017en\u011b 3.1 ukazuje, \u017ee s 90% jistotou m\u016f\u017eeme tvrdit, \u017ee pr\u016fm\u011brn\u00e9 sk\u00f3re v\u0161ech student\u016f se nach\u00e1z\u00ed mezi 74.9 a 81.1 body.<\/p>\n
    Funkce CONFIDENCE.T je v\u00fdznamn\u00fdm n\u00e1strojem pro anal\u00fdzu nejistoty ve va\u0161ich datech a najde uplatn\u011bn\u00ed v r\u016fzn\u00fdch oblastech statistick\u00e9 anal\u00fdzy.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Vr\u00e1t\u00ed interval spolehlivosti pro\u00a0st\u0159edn\u00ed hodnotu z\u00e1kladn\u00edho souboru pomoc\u00ed Studentova t-rozd\u011blen\u00ed<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[287],"tags":[],"class_list":["post-5483","post","type-post","status-publish","format-standard","hentry","category-statisticke"],"acf":[],"yoast_head":"\nFunkce CONFIDENCE.T v Excelu: jak funguje, primjeri kori\u0161tenja formule<\/title>\n<meta name=\"description\" content=\"Opis funkcije CONFIDENCE.T u Excelu i Google tablicama. 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