Z-BAHO ORQALI STANDARTLASHTIRISH USULI
Keywords:
standartlashtirish, Z-baho, statistik tahlil, standart normal taqsimot, o‘rtacha qiymat, standart og‘ish, Z-baho jadvali, g‘ayritabiiy qiymatlar (outlierlar)Abstract
Mazkur mustaqil ishda statistik tahlilda muhim ahamiyatga ega bo‘lgan standartlashtirish jarayoni va uning eng keng tarqalgan usullaridan biri -Z-baho orqali standartlashtirish usuli har tomonlama yoritilgan. Tadqiqotda standartlashtirish tushunchasining mohiyati, maqsadi va zaruriyati izohlangan hamda Z-bahoning nazariy asoslari va matematik ifodasi bayon etilgan. Shuningdek, standart normal taqsimot, Z-baho jadvali va 68–95–99,7 qoidasi asosida ma’lumotlarning taqsimotdagi o‘rni tahlil qilingan. Amaliy qismda real statistik ma’lumotlar asosida Z-bahoning hisoblanishi, hududlar o‘rtasidagi tafovutlarni aniqlash va ularni solishtirish imkoniyatlari ko‘rsatib berilgan. Ish natijalari Z-baho usuli ma’lumotlarni yagona mezon asosida baholash, g‘ayritabiiy qiymatlarni aniqlash va tahlil natijalarining ishonchliligini oshirishda samarali vosita ekanini tasdiqlaydi. Ushbu ish statistika, iqtisodiyot va boshqa ijtimoiy sohalarda ilmiy-amaliy ahamiyatga ega.
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