Video: Dab tsi yog conditional probability function?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Yam yuav tshwm sim yog cov qhov tshwm sim ntawm ib qho xwm txheej tshwm sim nrog qee qhov kev sib raug zoo rau ib lossis ntau lwm yam xwm txheej. Piv txwv li: Kev tshwm sim A yog tias nws los nag sab nraud, thiab nws muaj 0.3 (30%) muaj feem los nag hnub no. Kev tshwm sim B yog tias koj yuav tsum tau mus sab nraud, thiab qhov ntawd muaj a qhov tshwm sim ntawm 0.5 (50%).
Ntxiv mus, yog dab tsi yog conditional probability formula?
Yam yuav tshwm sim yog txhais raws li qhov tshwm sim ntawm qhov tshwm sim lossis qhov tshwm sim tshwm sim, raws li qhov tshwm sim ntawm qhov tshwm sim dhau los lossis qhov tshwm sim. Yam yuav tshwm sim yog xam los ntawm kev muab cov qhov tshwm sim ntawm qhov kev tshwm sim ua ntej los ntawm qhov hloov tshiab qhov tshwm sim ntawm kev vam meej, los yog raws cai , kev tshwm sim.
Tsis tas li ntawd, koj yuav daws qhov teeb meem tshwm sim li cas? Cov mis rau qhov xwm txheej yuav tshwm sim tuaj yeem muab tau los ntawm Txoj Cai Sib Tw 2 raws li hauv qab no:
- Pib nrog Txoj Cai Sib Tw 2.
- Faib ob sab ntawm kev sib npaug los ntawm P(A).
- Ncua tseg P(A) s ntawm sab xis ntawm kev sib npaug.
- Commute qhov sib npaug.
- Peb tau muab cov qauv rau kev ua tau zoo.
Ntawm no, vim li cas qhov xwm txheej tshwm sim tseem ceeb?
Muaj peev xwm ua tau yog Fundamental Qhov tseem ceeb .. Hauv qhov piv txwv ntawm kev faib tawm, cov pov thawj yog qhov tseem ceeb ntawm kev ntsuas, lossis cov yam ntxwv ntawm qhov kev faib tawm yuav tsum ua raws. Rau ib tug muab faib, ib tug sim ntsuas qhov qhov tshwm sim ntawm tau txais cov pov thawj sib txawv lossis cov qauv.
Dab tsi yog qhov muaj feem yuav tshwm sim hauv tshuab kev kawm?
Cov xwm yeem tshwm sim ntawm qhov xwm txheej A yog qhov qhov tshwm sim ntawm ib qho xwm txheej (A), muab tias lwm qhov xwm txheej (B) twb tshwm sim lawm. Nyob rau hauv cov nqe lus ntawm qhov tshwm sim , ob txheej xwm yog ywj siab yog tias tus qhov tshwm sim ntawm ib qho xwm txheej tshwm sim tsis muaj kev cuam tshuam rau qhov tshwm sim thib ob tshwm sim.
Pom zoo:
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Yuav ua li cas yog ib co piv txwv ntawm non probability sampling?
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Conditional proposition yog dab tsi?
Cov lus pom zoo. Ib qho kev tawm tswv yim ntawm daim ntawv "yog tias p ces q" lossis "p implies q", sawv cev "p → q" yog hu ua cov lus pom zoo. Piv txwv li: "yog tias John los ntawm Chicago ces John yog los ntawm Illinois". Lub tswv yim p yog hu ua hypothesis lossis antecedent, thiab cov lus qhia q yog qhov xaus lossis qhov tshwm sim