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Min aritmetik Takrif | Menu pandu arah

StatistikAritmetik


statistikkecenderungan memusatruang sampelmin geometrimin harmoni












Min aritmetik




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Dalam bidang statistik, min aritmetik ialah satu kaedah untuk menghitung kecenderungan memusat bagi suatu ruang sampel. Istilah "min aritmetik" lebih diutamakan daripada sekadar "min" atau "purata" dalam bidang matematik kerana boleh dibezakan dengan purata-purata jenis lain seperti min geometri dan min harmoni.


Min aritmetik boleh dihitung dengan mencampurkan semua unsur dalam ruang sampel yang berkenaan dan membahagikan hasil tambah itu dengan bilangan unsur yang terdapat dalam ruang sampel tersebut.


Secara umumnya, min digunakan dalam pengiraan kecenderungan memusat kecuali nilai ekstrem (nilai terpisah) wujud.



Takrif |



Min bagi data tak terkumpul |


Min bagi set data yang mengandungi sebanyak Ndisplaystyle N unsur x1,…,xNdisplaystyle x_1,dots ,x_N ditakrifkan oleh persamaan


x¯=x1+⋯+xNNdisplaystyle bar x=frac x_1+cdots +x_NN

atau


x¯=∑xNdisplaystyle bar x=frac sum xN


Min bagi data terkumpul |


Bila min bagi data terkumpul dicari, setiap kelas data diwakili oleh nilai yang dinamakan penanda kelas.


Penanda kelas bagi suatu kelas ialah titik tengah bagi kelas itu, iaitu


Penanda kelas=sempadan bawah+sempadan atas2displaystyle textPenanda kelas=frac textsempadan bawah+textsempadan atas2

Min bagi suatu set data terkumpul, x¯displaystyle bar x, ditakrifkan sebagai


x¯=∑fx∑fdisplaystyle bar x=frac sum f,xsum f

di mana fdisplaystyle f ialah kekerapan bagi kelas yang berkenaan, dan xdisplaystyle x ialah penanda kelas.









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