{"id":5891,"date":"2025-07-15T13:34:45","date_gmt":"2025-07-15T13:34:45","guid":{"rendered":"https:\/\/functiontranslator.com\/ztest\/"},"modified":"2021-02-26T10:06:27","modified_gmt":"2021-02-26T10:06:27","slug":"ztest","status":"publish","type":"post","link":"https:\/\/functiontranslator.com\/cs\/ztest\/","title":{"rendered":"ZTEST"},"content":{"rendered":"

Funkce ZTEST je statistick\u00fd n\u00e1stroj dostupn\u00fd v Excelu a Google Sheets, slou\u017e\u00edc\u00ed k posouzen\u00ed, zda existuj\u00ed statisticky v\u00fdznamn\u00e9 d\u016fkazy o tom, \u017ee pr\u016fm\u011br datov\u00e9 sady se li\u0161\u00ed od specifikovan\u00e9 hodnoty. Z\u00e1kladem tohoto testu je z-sk\u00f3re, je\u017e ur\u010duje, o kolik standardn\u00edch odchylek se pr\u016fm\u011br datov\u00e9 sady li\u0161\u00ed od pr\u016fm\u011bru populace.<\/p>\n

Popis a syntaxe funkce<\/h2>\n

Funkce ZTEST<\/code> m\u00e1 n\u00e1sleduj\u00edc\u00ed syntaxi:<\/p>\n

ZTEST(data; hodnota_potvrzen\u00ed; [sm\u011brodatn\u00e1_odchylka])<\/code><\/pre>\n
    \n
  • data<\/strong> – Rozsah, pole nebo odkaz na data, na kter\u00fdch se m\u00e1 prov\u00e9st Z-test.<\/li>\n
  • hodnota_potvrzen\u00ed<\/strong> – Hodnota, s n\u00ed\u017e se m\u00e1 porovnat pr\u016fm\u011br v datov\u00e9 sad\u011b.<\/li>\n
  • sm\u011brodatn\u00e1_odchylka<\/strong> (voliteln\u00e9) – Sm\u011brodatn\u00e1 odchylka populace, je-li zn\u00e1m\u00e1. Nen\u00ed-li uvedena, pou\u017eije se sm\u011brodatn\u00e1 odchylka vzorku.<\/li>\n<\/ul>\n
    P\u0159\u00edklad: M\u00e1te data v\u00fdsledk\u016f testu skupiny student\u016f a chcete zjistit, zda se jejich pr\u016fm\u011brn\u00e9 sk\u00f3re statisticky v\u00fdznamn\u011b li\u0161\u00ed od 75 bod\u016f.<\/p>\n
    =ZTEST(A1:A100; 75)<\/code><\/pre>\n
    P\u0159\u00edklady pou\u017eit\u00ed v praxi<\/h2>\n
    P\u0159\u00edklad 1: Hodnocen\u00ed produktu<\/strong><\/p>\n
    P\u0159edpokl\u00e1dejme, \u017ee m\u00e1te data o hodnocen\u00ed produkt\u016f z\u00e1kazn\u00edky na \u0161k\u00e1le od 1 do 5 a chcete ov\u011b\u0159it, zda je pr\u016fm\u011brn\u00e9 hodnocen\u00ed statisticky odli\u0161n\u00e9 od 3. Data jsou v bu\u0148k\u00e1ch B2:B501.<\/p>\n
    =ZTEST(B2:B501; 3)<\/code><\/pre>\n
    V\u00fdsledek funkce v\u00e1m poskytne p-hodnotu, kter\u00e1 indikuje, zda lze nebo nelze zam\u00edtnout nulovou hypot\u00e9zu, \u017ee pr\u016fm\u011brn\u00e9 hodnocen\u00ed je 3.<\/p>\n
    P\u0159\u00edklad 2: Zm\u011bna v\u00fdkonu po \u0161kolen\u00ed<\/strong><\/p>\n
    Firma prov\u00e1d\u011bla \u0161kolen\u00ed zam\u011bstnanc\u016f a chce zjistit, zda do\u0161lo k signifikantn\u00ed zm\u011bn\u011b v jejich v\u00fdkonu. Data p\u0159ed \u0161kolen\u00edm jsou v rozsahu D2:D52 a data po \u0161kolen\u00ed jsou v rozsahu E2:E52 s o\u010dek\u00e1van\u00fdm pr\u016fm\u011brn\u00fdm v\u00fdkonem 80.<\/p>\n
    =ZTEST(E2:E52; 80; STDEV.S(D2:D52))<\/code><\/pre>\n
    V tomto p\u0159\u00edpad\u011b se pou\u017e\u00edv\u00e1 sm\u011brodatn\u00e1 odchylka p\u0159ed \u0161kolen\u00edm jako odhad sm\u011brodatn\u00e9 odchylky populace pro spr\u00e1vn\u00e9 proveden\u00ed Z-testu.<\/p>\n
    Shrnut\u00ed a praktick\u00e9 tipy<\/h2>\n
    Funkce ZTEST<\/code> je efektivn\u00edm n\u00e1strojem pro statistick\u00e9 anal\u00fdzy v Excelu a Google Sheets, umo\u017e\u0148uj\u00edc\u00ed testov\u00e1n\u00ed hypot\u00e9z o pr\u016fm\u011brech datov\u00fdch sad. Je d\u016fle\u017eit\u00e9 vz\u00edt v \u00favahu velikost vzorku a p\u0159edpoklady o distribuci dat. P\u0159i interpretaci v\u00fdsledk\u016f je kl\u00ed\u010dov\u00e9 sledovat, zda p-hodnota dosahuje stanoven\u00e9 hranice v\u00fdznamnosti, obvykle 0,05.<\/p>\n","protected":false},"excerpt":{"rendered":"
    Vr\u00e1t\u00ed jednostrannou hodnotu pravd\u011bpodobnosti z-testu<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[289],"tags":[],"class_list":["post-5891","post","type-post","status-publish","format-standard","hentry","category-kompatibilita"],"acf":[],"yoast_head":"\nFunkce ZTEST v Excelu: jak funguje, primjeri kori\u0161tenja formule<\/title>\n<meta name=\"description\" content=\"Opis funkcije ZTEST u Excelu i Google tablicama. 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