Dab tsi yog qhov txawv ntawm ib qho tailed thiab ob tailed test?

2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17

A ib - rov test muaj tag nrho 5% ntawm qib alpha hauv ib ovj (hauv sab laug, lossis sab xis qab ). A ob - rov test splits koj qib alpha hauv ib nrab (raws li hauv duab rau sab laug). Cia peb hais tias koj ua haujlwm nrog tus qauv alpha theem ntawm 5%. A ob tailed test yuav muaj ib nrab ntawm qhov no (2.5%) hauv txhua qab.

Ua raws li qhov no hauv kev xav, dab tsi yog ib qho kev xeem tailed thiab ob qhov kev xeem tailed?

Basics ntawm a Ib - Tiav Test Hypothesis kuaj yog khiav los txiav txim seb qhov kev thov puas muaj tseeb lossis tsis yog, muab cov kev ntsuas pejxeem. A xeem uas tau ua los qhia seb qhov piv txwv ntawm cov qauv no puas loj dua thiab tsawg dua qhov nruab nrab ntawm cov pej xeem yog suav tias yog ob - rov test.

Tsis tas li ntawd, qhov kev xeem ob tailed yog dab tsi? Hauv kev txheeb cais, a ob - rov test yog ib txoj hauv kev uas qhov chaw tseem ceeb ntawm kev faib khoom yog ob - sab thiab kev xeem seb ib qho piv txwv loj dua los yog tsawg dua ib qho ntawm cov nqi. Nws yog siv nyob rau hauv null-hypothesis kuaj thiab kuaj rau qhov tseem ceeb.

Nyob rau hauv kev hwm rau qhov no, thaum twg yuav siv ib tug tailed thiab ob tailed xeem?

Qhov no yog vim a ob - tailed test siv ob qho tib si zoo thiab tsis zoo tails ntawm kev faib khoom. Hauv lwm lo lus, nws kev xeem rau qhov muaj peev xwm ntawm qhov zoo lossis qhov tsis zoo sib txawv. A ib - rov test yog qhov tsim nyog yog tias koj tsuas xav txiav txim seb puas muaj qhov sib txawv ntawm cov pab pawg hauv ib qho kev taw qhia tshwj xeeb.

Dab tsi yog qhov txawv ntawm ib tus tailed thiab ob tailed P tus nqi?

Hauv qhov piv txwv no, a ob - tus nqi P kuaj cov kev xav tsis tseeb uas cov tshuaj tsis hloov cov qib creatinine; ib ib - tus nqi P kuaj cov kev xav tsis tseeb tias cov tshuaj tsis nce qib creatinine.