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9. Seorang manajer bank ingin menentukan rata-rata deposito bulanan per nasabah di bank tersebut. Untuk mengestimasinya menggunakan tingkat kepercayaan (confidence interval). Berapa ukuran sampel yang

9. Seorang manajer bank ingin menentukan rata-rata deposito bulanan per nasabah di bank tersebut. Untuk mengestimasinya menggunakan tingkat kepercayaan (confidence interval). Berapa ukuran sampel yang harus diambil bila ia ingin yakin 99% dan kesalahannya tidak lebih dari 200 juta rupiah. Diasumsikan standar deviasi untuk deposito bulanan semua nasabah adalah 1 milyar rupiah

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