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Waktu yang diperlukan dalam suatu pelayanan pada Bank Sentosa adalah 40 menit dengan simpangan baku 8 menit. Suatu cabang Bank Sentosa yang baru diresmikan melakukan

Waktu yang diperlukan dalam suatu pelayanan pada Bank Sentosa adalah 40 menit dengan simpangan baku 8 menit. Suatu cabang Bank Sentosa yang baru diresmikan melakukan suatu penelitian dengan menerapkan prosedur baru dengan sampel sebanyak 16 orang dan diperoleh rata-rata pelayanan selama 30 menit. Ujilah kebenaran hasil penelitian itu dengan menggunakan = 5%.

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