Cov npoo ntawm qhov yuam kev cuam tshuam los ntawm peb yam: qib kev ntseeg siab, tus qauv loj, thiab cov pej xeem tus qauv sib txawv. Koj yuav tsum nkag siab tias qhov nce lossis txo qis npaum li cas ntawm cov xwm txheej no yuav cuam tshuam rau cov npoo ntawm qhov yuam kev.
Ob yam dab tsi cuam tshuam rau cov npoo ntawm qhov yuam kev?
Muaj ob yam uas cuam tshuam rau qhov kev ua yuam kev (MOE). Lawv yog qhov kev xaiv tsa tus qauv loj (n) thiab qhov kwv yees lossis kwv yees(p); qhov kwv yees qhov feem pua tsuas yog qhov kev xaiv tsa feem pua ntawm 100.
Yuav ua li cas koj pom cov npoo ntawm qhov yuam kev rau lub sijhawm kev ntseeg siab?
Lub sijhawm kev ntseeg siab yog qhov sib txawv ntawm tus qauv txhais tau tias rho tawm E, thiab tus qauv piv txwv ntxiv rau E. Nrhiav qhov txawv ntawm 2 tus lej (22.1-14.7=7.4). Faib tus lej ntawd los ntawm 2, vim qhov ntawd yuav qhia koj tias dab tsi tau ntxiv rau, thiab rho tawm los ntawm qhov nruab nrab. Yog li peb tau txais 7.4/2=3.7 rau qhov kev ua yuam kev.
Cov npoo ntawm qhov yuam kev hauv kev kwv yees txiav txim li cas?
qhov yuam kev siab tshaj plaws ntawm kev kwv yees, tseem hu ua cov npoo ntawm qhov yuam kev, yog qhov qhia txog qhov tseeb ntawm kev kwv yees thiab txhais tau tias yog ib nrab ntawm qhov dav ntawm kev ntseeg siab. yog ib nrab ntawm qhov dav ntawm kev ntseeg siab lub sijhawm.
Qhov kev ua yuam kev feem ntau yog dab tsi?
Ib feem ntawm qhov yuam kev feem ntau yog npaj rau ib qho ntawm peb theem sib txawv ntawm kev ntseeg siab; 99%, 95% thiab90%. Qib 99% yog qhov kev saib xyuas tshaj plaws, thaum qib 90% yog qhov tsawg tshaj plaws kev saib xyuas. Qib 95% yog qhov feem ntau siv.