Video: Yuav ua li cas koj xam lub sij hawm kwv yees?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
rau tus qauv loj (n). thiab faib qhov ntawd los ntawm lub hauv paus square ntawm n. Qhov no xam muab cov npoo ntawm qhov yuam kev rau koj.
Statistics For Dummies, 2nd Edition.
| Kev ntseeg siab | z*-tus nqi |
|---|---|
| 90% | 1.645 (los ntawm convention) |
| 95% | 1.96 |
| 98% | 2.33 |
| 99% | 2.58 |
Ua raws li qhov no, kuv yuav suav li cas 95% kev ntseeg siab ib ntus?
Los xam cov 95 % kev ntseeg siab ib ntus , pib los ntawm kev xam qhov nruab nrab thiab tus qauv yuam kev: M = (2 + 3 + 5 + 6 + 9) / 5 = 5. σM = 1.118. Z. 95 tuaj yeem pom siv qhov kev faib tawm ib txwm muaj tshuab xam zauv thiab qhia tias thaj chaw ntxoov ntxoo yog 0.95 thiab qhia tias koj xav kom thaj chaw nyob nruab nrab ntawm cov ntsiab lus txiav.
Tom qab ntawd, lo lus nug yog, dab tsi yog lub sijhawm luv luv? Ib lub sijhawm yog ib tug ntau yam ntawm cov nqi rau ib tug statistic. Piv txwv li, tej zaum koj yuav xav tias qhov nruab nrab ntawm cov ntaub ntawv teev poob qhov chaw ntawm 10 thiab 100 (10 < Μ < 100). Lub ntsiab lus muaj feem xyuam yog qhov kwv yees kwv yees, uas yog tus nqi tseeb, zoo li Μ = 55. Qhov ntawd "qhov chaw ntawm 5 thiab 15%" yog ib qho lub sijhawm kwv yees.
Kuj tseem xav paub, vim li cas peb thiaj li siv lub sijhawm kwv yees?
Point kev kwv yees muab peb tus nqi tshwj xeeb raws li ib qho kwv yees ntawm cov pejxeem parameter.. Kev kwv yees luv luv muab peb ntau yam ntawm qhov tseem ceeb uas yuav muaj cov pej xeem parameter. Qhov no lub sijhawm hu ua kev ntseeg siab lub sijhawm.
Qhov kev kwv yees ib ntus ntawm cov pejxeem txhais li cas?
Ib lub sijhawm kwv yees yog txhais los ntawm ob tus lej, ntawm qhov twg a pej xeem parameter yog hais dag. Piv txwv li, a <x<b yog ib qho lub sijhawm kwv yees ntawm pej xeem txhais tau tias Μ. Nws qhia tias cov pej xeem txhais tau tias ntau dua a tab sis tsawg dua b.
Pom zoo:
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