Koj pom P bar hauv kev txheeb cais li cas?
Koj pom P bar hauv kev txheeb cais li cas?

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Video: Koj pom P bar hauv kev txheeb cais li cas?
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Peb tseem yuav suav qhov nruab nrab qhov sib npaug thiab hu nws p - bar . Nws yog tag nrho cov kev ua tiav tau muab faib los ntawm tag nrho cov kev sim. Cov lus txhais uas tsim nyog tau qhia rau sab xis. Qhov kev xeem txheeb cais muaj cov qauv dav dav ib yam li yav dhau los (saib rho tawm yuav tsum muab faib los ntawm tus qauv yuam kev).

Hais txog qhov no, koj pom qhov kev faib ua feem hauv kev txheeb cais li cas?

Kwv yees p Cov qauv no kev faib ua feem yog sau li p^, pronounced p-hat. Nws yog xam tib txoj kev, tshwj tsis yog koj siv cov ntaub ntawv los ntawm cov qauv: tsuas yog faib tag nrho cov khoom hauv cov qauv los ntawm cov khoom koj xav tau. Piv txwv lo lus nug: Hauv kev soj ntsuam ntawm 3121 tus neeg, 412 tau txhaj tshuaj tiv thaiv qis dua.

Qhov thib ob, koj siv P kab kos li cas? A p - daim duab yog tus cwj pwm tswj daim duab siv nrog cov ntaub ntawv sau nyob rau hauv pawg sub ntawm ntau qhov sib txawv. Vim tias pawg pawg loj tuaj yeem sib txawv, nws qhia tau hais tias muaj feem cuam tshuam ntawm cov khoom tsis sib xws es tsis yog qhov suav tiag. P - kab kos qhia tias cov txheej txheem hloov pauv li cas rau lub sijhawm.

Yog li, p1 thiab p2 yog dab tsi hauv kev txheeb cais?

Qhov kev xeem txheeb cais ntawm ob qhov kev xeem yog Z-tus nqi. Z-tus nqi yog xam raws li: Qhov twg ( p1 ua โ€“ p2 ua ) yog qhov pom qhov sib txawv ntawm cov qauv proportions, ( P1 โ€“ P2 ) yog qhov sib txawv ntawm cov pejxeem proportions xav tias Ho yog qhov tseeb (hauv qhov piv txwv no ( P1 โ€“ P2 ) = 0).

P bar yog dab tsi?

Peb tseem yuav suav qhov nruab nrab qhov sib npaug thiab hu nws p - bar . Nws yog tag nrho cov kev ua tiav tau muab faib los ntawm tag nrho cov kev sim. Qhov ntsuas ntsuas muaj tib yam qauv zoo ib yam li ua ntej (saib rho tawm yuav tsum muab faib los ntawm tus qauv yuam kev).

Pom zoo: