Tus qauv sib txawv ntawm 1 txhais li cas?
Tus qauv sib txawv ntawm 1 txhais li cas?

Video: Tus qauv sib txawv ntawm 1 txhais li cas?

Video: Tus qauv sib txawv ntawm 1 txhais li cas?
Video: Tus cuj pwm ua neej ntawm tus neeg pluag? & tus neeg nplua nuj sib txawv li cas? 2024, Kaum ib hlis
Anonim

Nyob ntawm qhov kev faib tawm, cov ntaub ntawv hauv 1 standarddeviation ntawm txhais tau raug suav hais tias ncaj ncees thiab xav tau. Qhov tseem ceeb nws qhia rau koj tias cov ntaub ntawv tsis tshua muaj siab lossis tshwj xeeb qis. Ib qho piv txwv zoo yuav betolook ntawm qhov kev faib tawm ib txwm (qhov no tsis yog qhov kev faib tawm nkaus xwb).

Tom qab ntawd, ib tug kuj yuav nug, dab tsi yog tus qauv sib txawv ntawm 1?

Ib qho kev faib tawm nrog qhov nruab nrab ntawm 0 thiab a standarddeviation ntawm 1 npe a txheem normaldistribution. Vim qhov kev faib khoom muaj qhov nruab nrab ntawm 0 thiab a standard deviation ntawm 1 , Z kem yog sib npaug rau tus naj npawb ntawm standarddeviations hauv qab no (los yog saum toj no) ntsiab lus.

Tsis tas li ntawd, qhov sib txawv ntawm tus qauv yog dab tsi? Cov txheem sib txawv (SD) ntsuas tus nqi ntawm qhov sib txawv, lossis kev sib cais, rau cov ntaub ntawv kawm ntawm cov ntaub ntawv txhais tau tias , thaum lub txheem yuam kev ntawm txhais tau tias (SEM) ntsuas deb npaum li cas tus qauv txhais tau tias ntawm cov ntaub ntawv no yuav yog los ntawm cov neeg tiag tiag txhais tau tias . SD yog qhov dispersion ntawm cov ntaub ntawv nyob rau hauv ib txwm faib.

Ib yam li ntawd, koj tuaj yeem nug, tus qauv sib txawv tsawg dua 1 txhais li cas?

Nrov lus teb ( 1 ) Qhov no txhais tau tias uas distributions nrog acoefficient ntawm variation siab dua tshaj 1 raug suav hais tias yog behighvariance thaum cov neeg uas muaj CV qis dua 1 yog suav tias yog tsawg-variance. Nco ntsoov, txheem deviations tsis yog "zoo" lossis "phem". Lawv yog cov qhia txog kev nthuav tawm koj cov ntaub ntawv li cas.

Muaj pes tsawg tus qauv sib txawv ntawm qhov txhais tau li cas?

Yog tias cov ntaub ntawv faib tawm yog kwv yees li qub ces li ntawm 68 feem pua ntawm cov ntaub ntawv muaj nuj nqis nyob hauv ib qho kev sib txawv ntawm txhais tau tias (mathematically, Μ±σ, qhov twg Μ yog tus lej lej txhais tau tias ), kwv yees li 95 feem pua yog nyob rau hauv ob txheem deviations (Μ± 2σ), thiab kwv yees li 99.7 feem pua pob hauv peb standarddeviations (Μ ± 3 σ

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